An unmanned Pakistan naval aircraft crashed in the southern city of Karachi on Tuesday, but there was no damage on ground, police and naval officials said.

"It was a Pakistan Navy UAV (Unmanned Aerial Vehicle) and it was on a routine training sortie when it was hit by a bird," said Pakistan navy spokesman Commander Salman Ali.

The UAV, commonly known as a drone, is used by the navy for surveillance, reconnaissance and photography, he said but would not provide details on the make or manufacturer of the aircraft.