MIRANSHAH (Agencies) - A US drone strike on Monday killed four militants in Pakistans northwestern tribal region, officials said. The drone fired two missiles into a moving vehicle as it drove through a village near Mubarak Shah town about 15 kilometres east of Miranshah, the main town in North Waziristan district, Pakistani security officials said. Three militants have been killed in the attack, one security official said. The vehicle was moving. There are reports that four militants were killed in the strike but we are verifying the death of the fourth militant. We have confirmed the death of three others. The identities of the dead were not clear. A similar attack on Sunday killed four militants in Datta Khel town about 30 kilometres west of Miranshah.