A driver rammed a car into a gate of the FBI’s Pittsburgh office early Wednesday before walking away “like nothing happened” — in what the agency is treating as “an act of terror.”

The car — covered in profane messages — was plowed into the back entrance gate of the building on the Steel City’s south side around 2:40 a.m., with the driver getting out and hurling an American flag over the fence while shouting incoherently.

Authorities said they were hunting Donald Henson, a former military man with a history of mental health issues. 4

“We look at this as an act of terror against the FBI,” said FBI Pittsburgh Assistant Special Agent In Charge Christopher Giordano said, according to CBS News .

“This was a targeted attack on this building.”

The car appeared to have some profanity-l

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