Missiles fired from a suspected US drone slammed into a house used by militants in northwestern Pakistan killing seven people, a government official and a witness said. The identities of victims in Thursday's attack in Kurram region were not immediately known. A senior official in the region said the house targeted was believed to be frequented by Islamist militants. He spoke on condition of anonymity because he was not authorized to release the information. The missiles are believed fired from unmanned drones launched from neighboring Afghanistan, but the United States rarely acknowledges firing them.