Islamabad: Pakistan on Monday condemned a US drone strike in the lawless tribal belt bordering Afghanistan that killed at least four suspected militants, saying such attacks are "in total contravention of international law".

The condemnation from the Foreign Office came hours after the drone fired two missiles at a compound in Miranshah, the main town in North Waziristan Agency, which US and Afghan officials have described as a safe haven for Al Qaeda and Taliban elements.

At least four suspected militants were killed and several more injured in the attack, which was the first missile strike since March 30.

"The government of Pakistan strongly condemns the US drone attack that occurred in North Waziristan on Sunday. Such attacks are in total contravention of international law and established norms of interstate relations," Foreign office spokesman Moazzam Khan said in a late night statement.

Pakistan has "consistently maintained that drone attacks are violative of its territorial integrity and sovereignty. The matter will be taken up through diplomatic channels both in Islamabad and Washington," Khan said.

Reports from Miranshah said that the compound targeted by the drone was an abandoned girls' school that was being used by militants. Local residents said that over 20 suspected militants, including Arabs, were living in the compound.

The US drone fired two missiles at the compound. Local tribesmen said the injured could not be taken to hospital due to a curfew imposed in the region by authorities. A building in the compound caught fire after the missile strike.

This was the first drone attack after a joint session of the two houses of Pakistan's parliament adopted a resolution calling for an immediate halt to the missile strikes.

President Asif Ali Zardari reiterated the demand during a meeting with US Special Envoy for Afghanistan and Pakistan, Marc Grossman, in Islamabad last week.