An image taken from Twitter shows what appears to be the suspect in the attack in Manhattan on Tuesday, October 31, according to a senior law enforcement official who was shown the image.
PHOTO: From Twitter
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The Home Depot truck used in the bike path attack is removed from the crime scene, Wednesday, Nov. 1, 2017, in New York. (AP Photo/Mark Lennihan)
PHOTO: Mark Lennihan/AP
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A New York Police Department officer stands next to a body covered under a white sheet near a mangled bike along a bike path Tuesday Oct. 31, 2017, in New York. (AP Photo/Bebeto Matthews)
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NEW YORK, NY - OCTOBER 31: NYPD officers respond after reports of multiple people hit by a truck after it plowed through a bike path in lower Manhattan on October 31, 2017 in New York City. According to reports up to six people may have been killed. (Photo by Kena Betancur/Getty Images)
PHOTO: Kena Betancur/Getty Images
NEW YORK, NY - OCTOBER 31: NYPD officers respond after reports of multiple people hit by a truck after it plowed through a bike path in lower Manhattan on October 31, 2017 in New York City. According to reports up to six people may have been killed. (Photo by Kena Betancur/Getty Images)
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Investigators inspect a truck following a shooting incident in New York on October 31, 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.

 / AFP PHOTO / Don EMMERT        (Photo credit should read DON EMMERT/AFP/Getty Images)
PHOTO: DON EMMERT/AFP/Getty Images
Investigators inspect a truck following a shooting incident in New York on October 31, 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. / AFP PHOTO / Don EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
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NEW YORK, NY - OCTOBER 31: NYPD officers respond after reports of multiple people hit by a truck after it plowed through a bike path in lower Manhattan on October 31, 2017 in New York City. According to reports up to six people may have been killed. (Photo by Kena Betancur/Getty Images)
PHOTO: Kena Betancur/Getty Images
NEW YORK, NY - OCTOBER 31: NYPD officers respond after reports of multiple people hit by a truck after it plowed through a bike path in lower Manhattan on October 31, 2017 in New York City. According to reports up to six people may have been killed. (Photo by Kena Betancur/Getty Images)
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(CNN) —  

Federal prosecutors will seek the death penalty against the suspect in New York’s deadliest terror incident since 9/11, an attack that left eight people dead when a box truck went down a bicycle path.

Sayfullo Habibullaevic Saipov, who previously entered a plea of not guilty, faces an indictment that includes murder, attempted murder and terror-related charges in the October 31 rampage.

In a court filing Friday, prosecutors said Saipov, 30, committed the crimes “in an especially heinous, cruel and depraved manner.” They also cited his alleged support of the Islamic State and lack of remorse.

The suspect’s attorneys said in a statement that they were disappointed.

“We think the decision to seek the death penalty rather than accepting a guilty plea to life in prison with no possibility of release will only prolong the trauma of these events for everyone involved.”

Lawyers for the alleged terrorist have said President Donald Trump’s tweets calling for the death penalty and skewering Attorney General Jeff Sessions harms Sessions’ ability to make an impartial decision on how to handle his case.

The attorneys for Saipov pointed to tweets in the aftermath of the attack in which Trump advocated for a quick execution. They also point to a tweet deriding Sessions for not thinking of the political implications for his decision to indict two Republican congressman.

They want the judge to either rule out the possibility of the death penalty or appoint an independent prosecutor in the case.

Saipov, who told investigators he was motivated to use the truck by watching ISIS videos, was arrested during the incident. After his truck hit a school bus, stopping it in its tracks, he exited the vehicle, and a New York police officer shot him. Dozens of people were injured.