A missile attack by a US drone aircraft has killed at least 15 people in north-west Pakistan, officials say.

美国一艘无人战机在巴基斯坦西北部进行导弹袭击，造成至少15人死亡。

US drone attacks are being stepped up along the Afghan-Pakistan border

Four missiles hit the house of a local tribesman部落成员 in Shaktoi, South Waziristan, near the Afghan border, an official told the BBC.

The official said all those killed in the attack were militants¹.

Last week an attack in the same area reportedly targeted Pakistani Taliban leader Hakimullah Mehsud, but the Taliban say he survived.

"Now the death toll死亡人数 is 15. It could rise further. People are still busy removing rubble碎石," a senior security official told Reuters.

Most of the casualties伤亡 were foreign fighters, he added.

Another report said the house was being used by Uzbek militants fighting with the Taliban.

Hakimullah Mehsud has led the Pakistani Taliban since former leader Baitullah Mehsud was killed in a drone无人机，雄蜂 attack last summer.

The US has stepped up加速 drone attacks in north-west Pakistan since a suicide bomber³ killed seven CIA agents across the border in Afghanistan last month.