The Brooklyn man accused of setting off an explosive device near the Port Authority Bus Terminal on Manhattan's West Side on Dec. 11, causing minor injuries to three bystanders and disrupting morning commutes for many, pleaded not guilty on Thursday to a six-count indictment that included using a weapon of mass destruction.

Akayed Ullah, 27, who also suffered injuries in the blast, is also charged with providing material support to the Islamic State, conducting a terrorist attack on a mass transit system, bombing a public place, destruction of property with fire or explosives and using an improvised explosive device in furtherance of a crime.

Prosecutors say that Ullah used a pipe bomb filled with metal screws in the attack. The attack was the third to hit New York City over the last 17 months.