Islamabad - A suspected US airstrike on a house in Pakistan's restive tribal region along the Afghan border on Thursday killed at least seven people and injured several, a security official said.

Two missiles fired from a drone aircraft hit a compound in Tappi Wall village located along the Tochi River in North Waziristan, a safe-haven for al-Qaeda and Taliban militants launching crossborder attacks on US-led international forces in Afghanistan.

"At least three among the killed are believed to be foreigners," said a security official who spoke on condition of anonymity.

The term "foreigner" is used to refer to the fighters of Arab and central Asian origin linked with al-Qaeda terrorist network.

The strikes completely demolished the house of Maulvi Sehar Gul and Sultan Mohammad, two brothers who were Taliban supporter and frequently visited by insurgents.

The local residents feared the death toll might rise as some people were still trapped under the rubble. Taliban fighters sealed the area following the incident while suspected US drones were still seen flying in the area.

American forces have recently intensified airstrikes on suspected militants' hideouts inside Pakistan. Five days ago two US missiles fired from pilotless US plane killed two dozen people, including six al-Qaeda militants, in North Waziristan.

But the collateral damage caused by such aerial attacks have fuelled anger in Pakistan and strained relations between Islamabad and Washington, allies in the international fight against terrorism. (dpa)