Islamabad: An unmanned US spy plane struck a vehicle in the volatile North Waziristan tribal region of Pakistan on Thursday, killing seven suspected militants.

The CIA-operated drone fired two missiles at the car in Datta Khel area of the semi-autonomous tribal district; official sources were quoted as saying by channels.

Local residents said they had seen drones hovering over the area after the attack, the third missile strike since US Special Forces gunned down Osama bin Laden during a raid on a compound in the garrison city of Abbottabad on May 2.

The Pakistan government has said the drone attacks are a violation of its sovereignty and counter-productive in efforts to curb militancy in the tribal belt bordering Afghanistan.

(Agencies)