The 5 Most Shocking Things About NYC's Terror Suspect

NEW YORK, NY — There's still a lot investigators don't know about Tuesday's terror attack that killed eight people and injured 12. But alleged terrorist Sayfullo Saipov spelled out his twisted plot while laid up in Bellevue Hospital, according to a criminal complaint the FBI filed Tuesday.

That court filing, signed by an FBI special agent, contains gruesome details about what inspired the 29-year-old Islamic State follower and what he would have done if everything had gone his way.

Here are five of the most horrific allegations included in the document.

1. He showed no remorse

Saipov, who came to the U.S. from Uzbekistan in March 2010, told investigators he was satisfied with his massacre on the Hudson River Greenway, the complaint says. He mowed down pedestrians and cyclists in a rented pickup truck around 3 p.m. Tuesday before crashing into a school bus near Stuyvesant High School.

Saipov wanted to hang an ISIS flag in his hospital room and told law enforcement that he "felt good about what he had done," the criminal complaint says.

2. He watched violent ISIS videos for inspiration

Authorities recovered two of Saipov's cellphones from the truck, investigators said. One of them had about 90 ISIS propaganda videos on it, which Saipov said inspired him to plan an attack. They included footage of ISIS fighters running over a prisoner with a tank, another prisoner being shot in the face, a beheading and instructions for making a bomb.

3. He had been planning the strike for a year

Saipov had been planning an attack in the U.S. for about a year and, about two months ago, decided to use a truck "to inflict maximum damage against civilians," the complaint says. His plan seemed to follow instructions published in the ISIS magazine "Rumiyah" last year on how to carry out truck attacks.

The instructions call such strikes "just terror tactics," according to the complaint. Similar attacks in Europe have killed and wounded dozens of people in the past year.

4. He wanted to kill even more people

Saipov carried out the attack on Halloween because he knew more people would be out on the street, he told investigators. He originally planned to drive from the bike path to the Brooklyn Bridge to continue massacring pedestrians, according to the criminal complaint.

In a bag along with his cellphones were three knives, the sort of "secondary weapon" that ISIS encourages in this kind of attack, the complaint says. But Saipov was unable to reach them after crashing the truck.

5. He made a practice run

Saipov rented the pickup truck from a Home Depot in Passaic, N.J. just after 2 p.m. Tuesday before crossing the George Washington Bridge and getting on the West Side Highway, the complaint says. He considered hanging ISIS flags on it but didn't want to draw attention to himself, according to investigators.

Saipov rented a truck from the same store on Oct. 22 "so he could practice making turns with the truck in advance of his attack," the complaint says.

Also See: New York City Terror Victims Remembered In Home Countries

(Lead image: A photo of terror suspect Sayfullo Saipov is displayed at NYPD headquarters on Wednesday. Photo by Spencer Platt/Getty Images)