The two men accused of attempting to bomb Gracie Mansion, the residence of New York City’s mayor, pleaded not guilty Wednesday to federal terrorism charges as prosecutors outlined what they described as an attack plan inspired by extremist ideology. 

The suspects, Emir Balat, 18, and Ibrahim Kayumi, 19, entered their pleas in Manhattan federal court following their indictment on eight counts, including attempted use of a weapon of mass destruction, transportation of explosive materials, and providing material support to the Islamic State group.