Authorities are looking for the owner of a car that was left unoccupied at the back gate of the FBI's office in Pittsburgh.
Guards saw the vehicle pull up around 5 a.m. Thursday and the driver left.
FBI spokeswoman Catherine Policicchio says the city's bomb squad was called in. They examined the vehicle, which had non-threatening words painted on it, with a K-9 and robot.
The spokeswoman says the area was cleared and at no time was the public in any danger.
The FBI is not releasing any information about the suspect, but agents are working to talk with the owner of the vehicle.
