A Pennsylvania man, identified as 38-year-old Donald Henson of Penn Hills, rammed his car into the gate of the FBI’s Pittsburgh office early Wednesday in what officials called a targeted attack.

After the crash, he placed an American flag on the gate before fleeing on foot.

No injuries were reported, but the FBI described the act as terrorism and warned Henson may be dangerous.

Officials said he had recently visited the office to file a nonsensical complaint and may be experiencing mental health issues, ABC News has reported.

The FBI is leading the investigation and preparing federal charges.