After a gunman shot dead 58 people last month in Las Vegas, IS claimed the killer was also one of its "soldiers" but the Federal Bureau of Investigation said it found no such links with the accused, Stephen Paddock.
Investigators work around the wreckage of a Home Depot pickup truck a day after it was used in a terror attack in NY on November 1, 2017.
Saipov even rented a truck on October 22 to practise making turns and he initially hoped to get from the bike path across lower Manhattan to hit more pedestrians on the Brooklyn Bridge.
Saipov, an immigrant from Uzbekistan, is now in a detention facility on terrorism charges.
Screenshot of Saipov running during the attack.
Saipov did waive his right to remain silent or have an attorney when he agreed to speak to investigators from his bed at Bellevue Hospital Center in Manhattan, where he was being treated after being shot by a police officer, according to the criminal complaint.
On Thursday, mourners gathered to hold a vigil for the victims of the attack that also left 13 people injured.
According toThe New York Times, the suspect in the Halloween evening attack has been charged with federal terrorism offenses in Tuesday's attack that left eight dead.
He started planning the attack about a year ago while in the US - and two months ago, he chose to use a truck.
In the past few years, the Islamic State group has exhorted followers online to use vehicles, knives or other close-at-hand means of killing people in their home countries.
The president took to Twitter on Wednesday, saying Saipov should get the death penalty. "But when you say it, it makes it harder for DOJ to make that happen", tweeted Andrew C. McCarthy, a former assistant US attorney for the Southern District of NY. Trump said there was something "appropriate" about keeping Saipov where he committed the crime, and tweeted, "Should move fast".
The complaint listed two counts: provision of material support and resources to a designated foreign terrorist organization, and violence and destruction of motor vehicles.
The New York Times reported that he was a university-educated accountant from a well-off family who won the green card lottery and moved to OH, with dreams of prospering, before eventually being forced to find work as a trucker.
Saipov is a legal resident of the United States and came to U.S. in 2010 from Uzbekistan.