A manhunt has been launched after an FBI gate was rammed by a car 'carrying a message' in what they are classing as an act of terrorism.

Donald Henson, of Penn Hills, is wanted by cops who they say used his car to ram the barrier to the building at Pittsburgh Field, Pennsylvania, around 2.40am. on Wednesday morning. They say the suspect grabbed an American flag from inside the vehicle and hung it over the gate.

No one was injured during the incident, the FBI confirmed. Assistant Special Agent In Charge Christopher Giordano said the man ran from the scene as they urged the public to be on their guard. He said Henson is believed to have a history of mental health issues.

"We look at this as an act of terror against the FBI," Mr Giordano said. "This was a targeted attack on this building

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