A US drone strike on Sunday killed four people in North Wazirstan tribal area of Pakistan, bordering Afghanistan. At least four people have been killed while several more were injured by a US drone strike on Sunday in North Waziristan, a security official told media. Six US drones flew over the area when one of them fired two missiles at a compound in Data khel area. The security official said, "the drones kept hovering at the compound for a while and then one drone fired two missiles at the time of sunset." The drone strikes are very unpopular in Pakistan claiming it to be the violation of sovereignty of the country.