A US missile strike has killed four suspected militants in Pakistan's tribal region near the Afghan border, Pakistani officials say. They said the missile, fired by an unmanned drone, had destroyed a house near Miranshah in North Waziristan. The house had been used by the group of regional Taliban commander Hafiz Gul Bahadur, a security official told the BBC. Two more militants had been injured in the attack.The US does not generally confirm missile attacks by drones.