A gunman who fled in an armoured van has fired shots at the Police Headquarters in Dallas, a city in Texas, in the United States of America.
Dozens of police cars gave chase to the man involved who is in standoff in a car park.
Officials said there had been exchange of gunfire at the car park on Saturday.
Four bags were left outside the Police Headquarters, one of which contained explosives including pipe bombs.
An official said that one of the bags exploded as police robot attempted to move it, noting that no police officer was injured.
The motive for the shooting is not yet clear.
