Who is Donald Henson, man who rammed car into FBI Pittsburgh office, then walked away like nothing happened?

Donald Henson , a Pennsylvania man, is being hunted down after he allegedly rammed his car into a metal gate at the FBI Building in Pittsburgh Wednesday. The FBI said it was an intentional act which the agency is considering as "an act of terror". Donald Henson, of Penn Hills, Pennsylvania, allegedly drove at a high rate of speed toward the main entrance gate at about 2:40 am, FBI Special Agent in Charge Christopher Giordano told the media.

According to eyewitnesses, the man walked away from the scene like nothing happened. Bearing profane messaged on its body, the car 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.

"We look at this as an act of terror against the FBI," Giordano said. "This was a targeted attack on this building. Thankfully no one was hurt, but we are going to exhaust every ability we have under the federal law to find, apprehend and prosecute this subject to the fullest extent."

It was not immediately clear if Henson was armed, the FBI said.

Henson is a former military man, may have been experiencing a mental health issue

Henson is the registered owner of the vehicle, Giordano said. The FBI compared surveillance video with Henson's drivers license photo to further identify him, Giordano said, adding that he also had been identified as a former military member. He said Henson may have been experiencing a mental health issue.

After the crash, Henson allegedly exited the car, took an American flag out of the trunk and stuck it on the gate, the FBI said.

Henson had come to the FBI Pittsburgh office within the last few weeks to make a complaint, Giordano said, adding it "didn't make a whole lot of sense."