The man suspected of driving a truck into a Manhattan bike path, killing eight and injuring 12, followed instructions posted by Isis on social media “almost to a ‘T’,” the New York Police Department has revealed.

Although officials said they had uncovered no formal links to Isis or any other international extremist groups, the suspect planned his attack for weeks and carried it out in the name of Isis, according to NYPD deputy commissioner of intelligence and counterterrorism John Miller.

Police identified the suspect in the attack as 29-year-old Sayfullo Saipov, who was born in Uzbekistan and immigrated to the US in 2010. He is currently being treated in a New York hospital, after being shot by a police officer during the attack.

“He did this in the name of Isis,” Mr Miller said at a press conference on Wednesday. “Along with the other items recovered at the scene [were] some notes that further indicated that.”

The notes, the commissioner said, were hand-written in Arabic and read: “Islamic State will endure forever”.

Mr Miller added that the suspect appeared to have followed instructions that Isis members had posted on social media, teaching followers how to carry out such an attack.

Isis has released detailed instructions on carrying out vehicle attacks like those seen in Nice, Barcelona, and London. The group has named crowded streets as prime targets, and declared murdering civilians permissible under Islam.

New York Truck attack Show all 6 1 /6 New York Truck attack New York Truck attack Investigators inspect the truck following the attack Investigators inspect a truck following a shooting incident in New York on 31 October 2017. Several people were killed and numerous others injured in New York on Tuesday when a suspect plowed a vehicle into a bike and pedestrian path in Lower Manhattan, and struck another vehicle on Halloween, police said. A suspect exited the vehicle holding up fake guns, before being shot by police and taken into custody, officers said. The motive was not immediately apparent. Getty New York Truck attack A paramedic looks at a body along the bike path A paramedic looks at a body covered under a white sheet along the bike path 31 October 2017, in New York. A motorist drove onto a busy bicycle path near the World Trade Center memorial and struck several people Tuesday, police and witnesses said. AP Photo/Bebeto Matthews New York Truck attack The truck driver collided with a school bus Authorities respond near a damaged school bus Tuesday, 31 October 2017, in New York. A motorist drove onto a busy bicycle path near the World Trade Center memorial and struck several people, police and witnesses said. Two adults and two children were on the bus at the time. AP Photo/Bebeto Matthews New York Truck attack A young girl reacts to the scene A young girl reacts as police officers secure an area following a shooting incident in New York on 31 October 2017. Several people were killed and numerous others injured in New York on Tuesday after a vehicle plowed into a pedestrian and bike path in Lower Manhattan, police said. 'The vehicle struck multiple people on the path,' police tweeted. 'The vehicle continued south striking another vehicle. The suspect exited the vehicle displaying imitation firearms & was shot by NYPD.' DON EMMERT/AFP/Getty Images New York Truck attack Police officers arrive at the scene Police officers arrive at the scene following a shooting incident in New York on 31 October 2017. Multiple people were hurt in downtown Manhattan, US media reported after police confirmed that they were responding to reports of a shooting. Police said they had mobilized to the scene in Lower Manhattan and that one person was in custody, giving no further details. DON EMMERT/AFP/Getty Images New York Truck attack Emergency personnel respond to truck attack in lower Manhattan Emergency personal respond after reports of multiple people hit by a truck after it plowed through a bike path in lower Manhattan on 31 October 2017 in New York City. According to reports up to six people may have been killed. Kena Betancur/Getty Images

New York Governor Andrew Cuomo told CNN that Mr Saipov appeared to have been radicalised domestically, and followed the “lone wolf” model of attackers who were trained online, rather than in a training camp.

Members at a mosque near Mr Saipov’s New Jersey home told The Independent that they had seen him around, but that he was not a regular attendee. Mosque president Ibrahim Matarihe said the suspect was “not associated with the mosque”.

Mr Saipov had never been a suspect in FBI or NYPD investigations, according to Mr Miller. Authorities are now looking for ties between the suspect and others who had been named in investigations.

At the press conference, Mr Cuomo called the suspect a “depraved coward” who had failed in his goal to terrorise the city.

The day after the attack, Mr Cuomo noted, “people got up; they went to work; children went to school”.

“That’s what makes New Yorkers special,” he added. “That strength, that resilience, that ability to be undeterred in the face of ugliness.”

New York terror attack: What we know so far

Authorities have stepped up security throughout Manhattan in the wake of the attack, deploying officers and explosive-detecting dogs to subway stations and tourist attractions across the city.

But Mr Cuomo told CNN that authorities had no evidence yet of continuing or connected plots.

“Our only evidence to date is that this was an isolated incident that he himself performed,” the Governor said.

President Donald Trump, meanwhile, vowed to crack down on US immigration policies – particularly the diversity lottery programme, which the President claimed Mr Saipov had used to enter the country.

“We have to get much tougher and we have to get much smarter,” Mr Trump told reporters on Wednesday. “And we have to get much less politically correct. We’re so politically correct that we’re afraid to do anything.”

Sayfullo Saipov is suspected of mowing down pedestrians and cyclists along a busy bike path near the World Trade Centre memorial (St Charles County Department of Corrections/KMOV via AP)

Authorities say Mr Saipov rented a truck in New Jersey and drove it to lower Manhattan on the afternoon of 31 October. From there, he allegedly ploughed the truck through a foot path in the Tribeca neighbourhood, appearing to target cyclists and pedestrians.

The attack ended when Mr Saipov’s vehicle ran into a school bus, authorities said. The suspect exited his vehicle, allegedly brandishing a paintball gun and pellet gun, and was shot by police.

The attack killed eight people, six of whom came from countries other than the US. Five were visitors from Argentina, and one was from Germany, NYC Fire Department commissioner Dan Nigro said.