A missile attack by a US drone aircraft has killed at least 15 people in north-west Pakistan. A senior security official said four missiles hit the house of a local tribesman at Shaktoi in South Waziristan and all those killed in the attack were militants. He said the death toll could rise further as people are still busy removing rubble. <br/><br/>Another report said the house was being used by Uzbek militants fighting with the Taliban. <br/><br/>Last week an attack in the same area reportedly targeted Pakistani Taliban leader Hakimullah Mehsud, but the Taliban said he survived. Hakimullah Mehsud has led the Pakistani Taliban since former leader Baitullah Mehsud was killed in a drone attack last summer.