At least four people were killed Thursday in a suspected US drone attack in Pakistan's restive tribal region along the Afghan border, a security official said according to dpa. The attack targeted a house in Zafar Toban village near Miranshahin North Waziristan. A security official said on the condition of anonymity that the drones fired two missiles that destroyed the hideout and also killed four militants. The death toll could not be verified through independent sources because the area is closed to media and aid groups, dpa added.