Officials label the incident a targeted act against the FBI building, signaling a deliberate attack rather than an accident.
A man rammed the gate with a white Toyota around 2:40 a.m., then left, retrieved a flag from inside, and placed it on the gate before fleeing.
The suspect, identified as Donald Henson of Penn Hills, drove toward the main entrance at about 2:40 a.m., raising questions about security and motives.