A day after Pakistan army chief General Ashfaq Parvez Kayani warned US against violating its sovereignty, CIA-operated drones struck in North Waziristan killing at least 10 militants and injuring several others, the first since Osama bin Laden's death.

The unmanned CIA operated spy planes fired at least four missiles at a compound and a vehicle in Datta Khel area of North Waziristan Agency, officials told the media.