
The terrorists who killed 14 people and wounded over a hundred in Catalonia had originally planned to drive three vans packed with explosives into iconic parts of Barcelona including the Sagrada Familia cathedral, it has been reported.

Had their butane-filled gas containers not accidentally detonated the night before the atrocities on Thursday, the 12-person terror cell would have used them to maximise deaths in the tourist hotspots of the Spanish city, local media suggest.

They intended to explode one van in Las Ramblas, a second by the world-famous Sagrada Familia cathedral and the last in the port area of the city, El Espanol has claimed.

To detonate the gas, they intended to use the same TATP explosives - also known as the 'Mother of Satan' - that were blown up in the 7/7 bombings in London.

The cathedral, a UNESCO World Heritage Site, is one of the most visited attractions in Europe.

Architect Antonio Gaudi began construction in 1882 and, despite him dying in 1926, it is still officially incomplete.

In 2010 it was consecrated by Pope Benedict XVI as a minor basilica.

It has been reported that the terrorist intended to explode one van in Las Ramblas, a second by the world-famous Sagrada Familia cathedral (pictured) and the last in the port area of the city

Gas canisters which contained deadly butane gas were recovered from a home in Alcanar, 60 miles south of Barcelona, and were seen outside the address today

The hired van (pictured), registered to rental company Telefurgo, rammed into scores of holidaymakers and their children before police swooped. It is believed the suspected jihadist plot originally included the use of a large truck and explosives designed to maximise the death toll

Police revealed on Thursday night that the explosion less than 24 hours earlier was linked to the plot, and documents found at the scene contains details of the attack

Investigators believe a 12-strong terror cell planned to detonate the highly-explosive gas, using plastic explosive TATP - which was also found at the site - in its attack on the Catalan city's tourist district.

But less than 24 hours before the atrocity, one member was killed in an accidental blast. Police have said there may still be another body buried in the rubble of the house in Alcanar, which is more than 120 miles south of Barcelona.

More than 20 butane gas canisters were found intact in the wreckage, as well as Acetone peroxide (TATP) - nicknamed 'Mother of Satan' because of the high number of accidental explosions it causes.

The discovery supports claims by Spanish police that the gang planned to murder hundreds in a terrorist 'spectacular'.

Spain's King Felipe VI and his wife Queen Letizia have paid a visit to staff at the Mar de Barcelona hospital to thank them for their work in the wake of the terror atrocities

The royals were also visiting victims of the devastating attacks. It comes on the day a Spanish newspaper reported that the terrorists originally intended to detonate bombs - including outside Barcelona's Sagrada Familia cathedral - to maximise deaths

Security experts also believe the gang wanted to hire a large truck like the one used to devastating effect in the Nice atrocity two years ago, but they were unable to get permits so had to settle with smaller vans. Pictured: King Felipe VI meets a Catalonia police officer

Had the explosion not happened, a police chief said, Thursday's attack would have had 'bigger scope'.

Last night Catalonia's police force tweeted: 'We are working to determine if remains at Alcanar are a second corpse/We are working to determine if biological traces from Alcanar are human.'

Security experts believe the gang wanted to hire a large truck like the one used to devastating effect in the Nice atrocity two years ago, but they were unable to get permits so had to settle with smaller vans.

Security experts believe the gang wanted to hire a large truck like the one used to devastating effect in the Nice atrocity two years ago, but they were unable to get permits so had to settle with smaller vans

A police officer walks past large numbers of gas canisters outside the address in Alcanar where a member of the terror cell died in the explosion ahead of Thursday's atrocity in Barcelona

Barcelona's port area (pictured) may have been another target for the terror cell, it has been reported. It has been claimed they were planning to drive a van packed with gas canisters into the most popular parts of the Catalan city

One person linked to the atrocity has been arrested at the scene of the explosion, authorities confirmed on Thursday night.

Police confirmed on Friday afternoon that the suspects had been planning to use explosives in the mass killing.

Josep Lluis Trapero of Catalonia's police said: 'They were preparing one or several attacks in Barcelona, and an explosion in Alcanar stopped this as they no longer had the material they needed to commit attacks of an even bigger scope.'

Initially treated as a random gas blast, police later linked to the explosion to the Barcelona assault, believing occupants of the house were preparing an explosive device inside and slipped up.

Trapero said that after this, the suspects allegedly quickly went on to commit 'more rudimentary' attacks. These involved the vehicles ploughing into pedestrians in Barcelona and Cambrils.

The Cambrils suspects had an axe and knives in the car as well as fake explosive belts stuck to their bodies, said police.

Thirteen people were killed and more than 100 wounded when a van was driven into walkers on the busy Las Ramblas street in Barcelona.

It has also been claimed that a cell of 12 people may have been involved in the attacks on Barcelona and Cambrils - and that they were planning to use gas canisters to kill victims

Pictured: A man lying on the street in Barcelona after the van ploughed into pedestrians along Las Ramblas

Moussa Oukabir, 18, who lives in Barcelona, has been named as a suspect in the attack after reportedly stealing his brother's documents

Driss Oukabir (pictured) has been arrested by police, according to local media reports. The Guardia Civil previously said the van used in the attack was rented by Oukabir in the town of Santa Perpetua de la Mogada

Pictured: A man sits on the pavement with his head in his hands after the tragic attack, now being treated as a terrorist incident

In a second attack eight hours later, a car rammed into people in Cambrils - about 75 miles south of Barcelona - and wounded six people before the five attackers were shot.

But the New York Times has been told that the terror plot originally involved the use of a large truck and explosives.

A counter-terror expert told the paper: 'Part of the plan was they tried to rent a larger truck, but they didn't have the right permit.'

As a consequence, they ended up renting much smaller vehicles - including the white Fiat van photographed with a crumpled bonnet after the devastating slaughter in Las Ramblas.

Pictured: Armed policemen arrive in a cordoned-off area after a van ploughed into a crowd in Barcelona

At least 13 people have been killed and dozens injured after a van ploughed into pedestrians in Las Ramblas, Barcelona's busiest tourist area. Police are still hunting two armed men who have escaped and are believed to be hiding in a nearby restaurant

Police are today hunting for Europe's most wanted man Moussa Oukabir, an 18-year-old Moroccan-born teenager believed to have been the driver during the Barcelona attack.

He fled on foot and it is unclear if he joined the Cambrils attack eight hours later.

His brother Driss Oukabir's ID was used to rent up to three vans including the one in the attack, but he has handed himself into police and denied any involvement.

Investigators believe the Barcelona atrocity is linked to an explosion at a home 70 miles away in Alcanar which happened 24 hours earlier.

Horrifying images of the aftermath show an elderly couple were among the injured after the van ploughed into pedestrians on the busy Barcelona street

Two suspects were arrested yesterday evening, a Moroccan and a Spanish national, but neither of them was at the wheel of the van. Four suspects have been arrested in total.

In Barcelona, officials warn the death toll is likely to rise, with at least 10 people critically injured in yesterday afternoon's atrocity in the heart of the city's tourist district.

In the aftermath of the attack police circulated an image of Driss Oukabir, a 28-year-old Catalan resident of Moroccan origin, saying he had rented out a second van thought to be intended as a getaway vehicle - where his documents were found.

But police sources said Oukabir later handed himself in at a police station in Ripoll, 65 miles north of Barcelona, claiming his brother had stolen his documents.

There were harrowing scenes in Barcelona after the van was driven into pedestrians in Las Ramblas in the heart of the city

Hundreds of people can be seen in Barcelona city centre after the horrifying incident

His brother is named Moussa Oukabir, 18, who lives in Barcelona, El Pais reports.

Disturbing comments posted on social network Kiwi by an account carrying Moussa Oukabir's name and photograph makes reference to killing all infidels.

Horrifying pictures and video from the scene of the Las Ramblas attack show armed police and paramedics rushing around the busy promenade in the centre of the city, as victims lie hurt in the street.

Video has emerged seeming to show a police officer lying on the ground injured in Sant Just Desvern, on the outskirts of Barcelona, after a Ford Focus drove through a roadblock.

Eyewitnesses reported seeing people running away and screaming after the terror attack happened.

Steve Garrett was in a nearby market and sheltered in a bakery with several others after streams of people ran inside.

He told the BBC: 'A very large number of people ran into the market area in a big kind of way, lots of screaming, lots of shouting.

'The security guards immediately responded. We ran into the bakery with four or five other people and ran straight upstairs and hunkered down whilst an enormous wave of people went through the market.

'Obviously coming from England it was reminding me a great deal of what happened in London, so we were very concerned about what might be going on next.'