The man charged with killing eight people in a terrorist attack in lower Manhattan on Tuesday told investigators he “felt good about what he had done,” and asked to display an ISIS flag in his hospital room, according to prosecutors.

Sayfullo Saipov, 29, has been charged with providing material support to a terrorist group. The FBI announced it is seeking a second suspect in the incident.

Saipov is accused of driving a rented Home Depot truck through a bicycle path, killing eight people and injuring 11 others. Saipov allegedly told investigators that he chose Halloween for the date of his attack because he thought more people would be on the street.

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Saipov exited the vehicle brandishing a pellet gun and paintball gun before being shot in the abdomen by police. He was taken into custody and taken to the hospital.

A couple hours after the incident, officials declared it an “act of terrorism.”

Saipov is originally from Uzbekistan and has permanent resident status in the U.S.