Authorities continue to investigate the terror attacks in Spain continue to hunt for one more suspect they think it connected to the attack.

Moussa Oukabir, the suspected driver of a van which killed 13 people in Barcelona, was reportedly one of the attackers shot dead by police in Cambrils.

They continue to hunt for Younnes Abouyaaqoub.

Investigators believe a cell of at least eight people may have been involved and had been planning to use gas canisters, according to a judicial source. Here is the latest:

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The driver of a van used to kill at least 13 people in Barcelona remains at large, with police focusing their manhunt on 18-year-old Moussa Oukabir.

​Spanish media reported statements allegedly made by the teenager on social media two years ago, where he was asked what he would do if made ruler of the world.

“Kill all infidels and only allow Muslims to continue the religion," Moussa reportedly answered, going on to say the only country he would never live in is “the Vatican”.

He is the brother of Driss Oukabir, an arrested suspect who told police his brother stole his ID to rent the van used in the attack.

Spanish authorities believe there were at least eight people involved in the attacks and that the group had planned to use butane gas canisters, a judicial source has said.

Another source told Spanish newspaper El Pais at least 12 members of the cell had been identified.

Separately, a Catalan government official told local radio that it was possible that attackers had meant to use canisters in Tuesday's attacks.

Four people have so far been arrested in connection with the attacks, which left 14 people dead and more than 100 injured.

World reacts: Barcelona terror attack

The casualties included several children and came from 24 different countries, the Catalan government said, ranging from France and Germany to Pakistan and the Philippines.

The attack on Barcelona’s famous La Rambla street, a favourite of tourists and locals alike, was suspected to be the first of a planned wave of attacks.

Isis claimed responsibility for the ramming, which mirrored previous attacks in London and other European cities, on Thursday night.

A statement released via its Amaq propaganda agency said the assault was perpetrated by “soldiers of the Islamic State [who] carried out the operation in response to calls targeting coalition countries”, referring to the US-led coalition bombing its territories in Iraq and Syria.

The wording echoed previous claims of responsibility for atrocities that were inspired by the group’s propaganda but not directed by militants abroad.

As security forces hunted for the van's driver, who was seen escaping on foot, police said killed five attackers who rammed a car into five civilians and a police officer in the town of Cambrils.

A woman injured in the ramming died of her injuries in hospital on Friday, Catalan authorities said, bringing the death toll of the two attacks to 14.

The suspected terrorists, who were wearing fake explosives belts, were shot dead and authorities carried out a series of controlled explosions.

Barcelona Attack Show all 30 1 /30 Barcelona Attack Barcelona Attack Police officers patrol on Las Ramblas following yesterday's terrorist attack, on August 18, 2017 in Barcelona, Spain. Thirteen people were killed and dozens injured when a van hit crowds in the Las Ramblas area of Barcelona on Thursday. Spanish police have also killed five suspected terrorists in the town of Cambrils to stop a second terrorist attack Getty Images Barcelona Attack Tourists and locals walk along Las Ramblas following yesterday's terrorist attack, on August 18, 2017 in Barcelona, Spain. Thirteen people were killed and dozens injured when a van hit crowds in the Las Ramblas area of Barcelona on Thursday. Spanish police have also killed five suspected terrorists in the town of Cambrils to stop a second terrorist attack. Getty Images Barcelona Attack Police officers patrol on Las Ramblas following yesterday's terrorist attack, on August 18, 2017 in Barcelona, Spain. Thirteen people were killed and dozens injured when a van hit crowds in the Las Ramblas area of Barcelona on Thursday. Spanish police have also killed five suspected terrorists in the town of Cambrils to stop a second terrorist attack. Getty Images Barcelona Attack People leave a fastfood with hands up as asked by policemen after a van ploughed into the crowd, killing two persons and injuring several others on the Rambla in Barcelona on August 17, 2017. A driver deliberately rammed a van into a crowd on Barcelona's most popular street on August 17, 2017 killing at least two people before fleeing to a nearby bar, police said. Officers in Spain's second-largest city said the ramming on Las Ramblas was a "terrorist attack" and a police source said one suspect had left the scene and was "holed up in a bar". The police source said they were hunting for a total of two suspects AFP/Getty Barcelona Attack Police officers tell members of the public to leave the scene in a street in Barcelona, Spain, Thursday, Aug. 17, 2017. Police in the northern Spanish city of Barcelona say a white van has jumped the sidewalk in the city's historic Las Ramblas district, injuring several people. AP Barcelona Attack Injured people react after a van crashed into pedestrians in Las Ramblas, downtown Barcelona, Spain, 17 August 2017. According to initial reports a van crashed into a crowd in Barcelona's famous Placa Catalunya square at Las Ramblas area injuring several. Local media report the van driver ran away, metro and train stations were closed. The number of people injured and the reasons behind the incident are not yet known. Official sources have not confirmed that the incident is a terrorist attack. EPA Barcelona Attack People flee the scene in Barcelona, Spain, Thursday, Aug. 17, 2017 after a white van jumped the sidewalk in the historic Las Ramblas district, crashing into a summer crowd of residents and tourists and injuring several people, police said. (AP Photo/Giannis Papanikos) AP Barcelona Attack People are pictured inside Systemaction, a locked down store after a van crashed into crowds on Las Ramblas in Barcelona, Spain, August 17, 2017. Courtesy Abbie Yermus/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS Barcelona Attack People take shelter inside a shop in Barcelona, Spain, Thursday, Aug. 17, 2017. A white van jumped up onto a sidewalk and sped down a pedestrian zone Thursday in Barcelona's historic Las Ramblas district, swerving from side to side as it plowed into tourists and residents. Police said 13 people were killed and more than 50 wounded in what they called a terror attack. (AP Photo/Manu Fernandez) AP Barcelona Attack People move from the scene after a van crashed into pedestrians near the Las Ramblas avenue Reuters Barcelona Attack A policeman stands next to an ambulance after a van ploughed into the crowd, injuring several persons on the Rambla in Barcelona AFP/Getty Images Barcelona Attack People are evacuated from a street after a van crashed into pedestrians near the Las Ramblas avenue in central Barcelona, Spain, August 17, 2017. REUTERS/Stringer NO RESALES. NO ARCHIVE. Reuters Barcelona Attack Firefighters stands outside an evacuated mall after a van ploughed into the crowd, injuring several persons on the Rambla in Barcelona AFP/Getty Images Barcelona Attack Policemen stand next to vehicles in a cordoned off area after a van ploughed into the crowd, injuring several persons on the Rambla in Barcelona AFP/Getty Images Barcelona Attack Plain-clothes policemen phone as they walk past police cars in a cordoned off area after a van ploughed into the crowd, injuring several persons on the Rambla in Barcelona AFP/Getty Images Barcelona Attack A policemen and a medical staff member stand past police cars and an ambulance in a cordoned off area after a van ploughed into the crowd, injuring several persons on the Rambla in Barcelona AFP/Getty Images Barcelona Attack A person is stretched out of a mall by medical staff members in a cordoned off area after a van ploughed into the crowd, injuring several persons on the Rambla in Barcelona on August 17, 2017. Police in Barcelona said they were dealing with a "terrorist attack" after a vehicle ploughed into a crowd of pedestrians on the city's famous Las Ramblas boulevard on August 17, 2017. Police were clearing the area after the incident, which has left a number of people injured. AFP/Getty Images Barcelona Attack Children, some in tears, are escorted down a road in Barcelona, Spain, Thursday, Aug. 17, 2017. Police in Barcelona say a white van has mounted a sidewalk, struck several people in the city's Las Ramblas district. AP Barcelona Attack Mossos d'Esquadra Police officers and emergency service workers move an injured man, after a van crashes into pedestrians in Las Ramblas, downtown Barcelona, Spain, 17 August 2017. According to initial reports a van crashed into a crowd in Barcelona's famous Placa Catalunya square at Las Ramblas area injuring several. Local media report the van driver ran away, metro and train stations were closed. The number of people injured and the reasons behind the incident are not yet known. Official sources have not confirmed that the incident is a terrorist attack. EPA Barcelona Attack Mossos d'Esquadra Police officers attend injured people after a van crashed into pedestrians in Las Ramblas, downtown Barcelona, Spain, 17 August 2017. According to initial reports a van crashed into a crowd in Barcelona's famous Placa Catalunya square at Las Ramblas area injuring several. Local media report the van driver ran away, metro and train stations were closed. The number of people injured and the reasons behind the incident are not yet known. Official sources have not confirmed that the incident is a terrorist attack. EPA Barcelona Attack Injured people react after a van crashed into pedestrians in Las Ramblas, downtown Barcelona, Spain, 17 August 2017. According to initial reports a van crashed into a crowd in Barcelona's famous Placa Catalunya square at Las Ramblas area injuring several. Local media report the van driver ran away, metro and train stations were closed. The number of people injured and the reasons behind the incident are not yet known. Official sources have not confirmed that the incident is a terrorist attack. EPA Barcelona Attack A police officer cordon off a street in Barcelona, Spain, Thursday, Aug. 17, 2017. Police in the northern Spanish city of Barcelona say a white van has jumped the sidewalk in the city's historic Las Ramblas district, injuring several people. AP Barcelona Attack TOPSHOT - Policemen check the area after towing away the van which ploughed into the crowd, killing at least 13 people and injuring around 100 others on the Rambla in Barcelona, on August 18, 2017. A driver deliberately rammed a van into a crowd on Barcelona's most popular street on August 17, 2017 killing at least 13 people before fleeing to a nearby bar, police said. Officers in Spain's second-largest city said the ramming on Las Ramblas was a "terrorist attack". The driver of a van that mowed into a packed street in Barcelona is still on the run, Spanish police said. / AFP PHOTO / Josep LAGOJOSEP LAGO/AFP/Getty Images AFP/Getty Images Barcelona Attack TOPSHOT - Armed policemen stand in a cordoned off area after a van ploughed into the crowd, injuring several persons on the Rambla in Barcelona on August 17, 2017. Police in Barcelona said they were dealing with a "terrorist attack" after a vehicle ploughed into a crowd of pedestrians on the city's famous Las Ramblas boulevard on August 17, 2017. Police were clearing the area after the incident, which has left a number of people injured. / AFP PHOTO / Josep LAGOJOSEP LAGO/AFP/Getty Images AFP/Getty Barcelona Attack A man displays flowers at the Canaletas fountain on the Rambla boulevard on August 18, 2017, a day after a van ploughed into the crowd, killing 13 persons and injuring over 100 on the Rambla in Barcelona. Drivers have ploughed on August 17, 2017 into pedestrians in two quick-succession, separate attacks in Barcelona and another popular Spanish seaside city, leaving 13 people dead and injuring more than 100 others. In the first incident, which was claimed by the Islamic State group, a white van sped into a street packed full of tourists in central Barcelona on Thursday afternoon, knocking people out of the way and killing 13 in a scene of chaos and horror. Some eight hours later in Cambrils, a city 120 kilometres south of Barcelona, an Audi A3 car rammed into pedestrians, injuring six civilians -- one of them critical -- and a police officer, authorities said. / AFP PHOTO / Josep LAGOJOSEP LAGO/AFP/Getty Images AFP/Getty Images Barcelona Attack TOPSHOT - The van who ploughed into the crowd, killing at least 13 people and injuring around 100 others is towed away from the Rambla in Barcelona on August 18, 2017. A driver deliberately rammed a van into a crowd on Barcelona's most popular street on August 17, 2017 killing at least 13 people before fleeing to a nearby bar, police said. Officers in Spain's second-largest city said the ramming on Las Ramblas was a "terrorist attack". The driver of a van that mowed into a packed street in Barcelona is still on the run, Spanish police said. / AFP PHOTO / Josep LAGOJOSEP LAGO/AFP/Getty Images AFP/Getty Barcelona Attack TOPSHOT - Forensic policemen arrive in the cordoned off area after a van ploughed into the crowd, killing 13 persons and injuring over 80 on the Rambla in Barcelona on August 17, 2017. A driver deliberately rammed a van into a crowd on Barcelona's most popular street on August 17, 2017 killing at least 13 people before fleeing to a nearby bar, police said. Officers in Spain's second-largest city said the ramming on Las Ramblas was a "terrorist attack". / AFP PHOTO / Josep LAGOJOSEP LAGO/AFP/Getty Images AFP/Getty Images Barcelona Attack TOPSHOT - A person is helped by Spanish policemen and two men after a van ploughed into the crowd, killing at least 13 people and injuring around 100 others on the Rambla in Barcelona on August 17, 2017. A driver deliberately rammed a van into a crowd on Barcelona's most popular street on August 17, 2017 killing at least 13 people before fleeing to a nearby bar, police said. Officers in Spain's second-largest city said the ramming on Las Ramblas was a "terrorist attack". The driver of a van that mowed into a packed street in Barcelona is still on the run, Spanish police said. / AFP PHOTO / Nicolas CARVALHO OCHOANICOLAS CARVALHO OCHOA/AFP/Getty Images AFP/Getty Images Barcelona Attack TOPSHOT - Policemen accompany clients of a store outside a cordoned off off area after a van ploughed into the crowd, killing 13 persons and injuring over 80 on the Rambla in Barcelona on August 17, 2017. A driver deliberately rammed a van into a crowd on Barcelona's most popular street on August 17, 2017 killing at least 13 people before fleeing to a nearby bar, police said. Officers in Spain's second-largest city said the ramming on Las Ramblas was a "terrorist attack". / AFP PHOTO / LLUIS GENELLUIS GENE/AFP/Getty Images AFP/Getty Images Barcelona Attack TOPSHOT - Forensic policemen arrive in the cordoned off area after a van ploughed into the crowd, killing at least 13 people and injuring around 100 others on the Rambla in Barcelona. A driver deliberately rammed a van into a crowd on Barcelona's most popular street on August 17, 2017 killing at least 13 people before fleeing to a nearby bar, police said. Officers in Spain's second-largest city said the ramming on Las Ramblas was a "terrorist attack". The driver of a van that mowed into a packed street in Barcelona is still on the run, Spanish police said. / AFP PHOTO / PAU BARRENAPAU BARRENA/AFP/Getty Images AFP/Getty Images

“The priority right now is work out the identity of these people, to prove and show the relationship between the different people involved, those that took the van and those that have been able to escape,” said Joaquim Forn, a Catalan government official.

Police said the incident was linked to the Barcelona attack, as was an explosion that destroyed a house in Alcanar, Catalonia.

Around 20 bottles of gas were reportedly found within the ruins of the house, which analysts say could be packed into a vehicle to create an explosive device – a technique previously used by foiled Isis plotters in Paris.

Vans, lorries and cars have also been used in previous Isis-linked attacks in London, Nice, Berlin, Stockholm and Paris.

One person died in the explosion in Alcanar but has not yet been named by police.

One of the attack suspects was arrested in the town on Thursday, which lies around 120 miles south of Barcelona.

Prime Minister Mariano Rajoy has announced three days of official mourning for what he called a “jihadist attack.”