FBI officials say they are familiar with a man who rammed a car into a Pittsburgh building gate. Photo: AP PHOTO

A driver has rammed a car into a security gate at the FBI building in Pittsburgh, then removed a United States flag from the back seat and threw it over the gate before leaving, authorities say.

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The car crashed into the gate about 2.40am, the FBI said, and authorities were searching for the man.

Investigators, including a bomb squad, were at the scene.

No explosives were found, the FBI said.

"We look at this as an act of terror against the FBI," Christopher Giordano, a

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