The exact target of the strike has not been disclosed. No senior al Qaeda or allied jihadist commanders from foreign terrorist groups are reported to have been killed in the strike.
The attack took place in Gurbuz town, 65 kilometres southwest of Miranshah, the main town in North Waziristan tribal district, a security official said.
“The drones fired two missiles on a house believed to be a militant centre. Four militants were killed and two injured,” he said.
Pakistan has regularly criticized U.S. drone attacks, describing them as counterproductive and a violation of its sovereignty. But U.S. officials say the armed drones have proved a vital weapon in the campaign against the insurgency along the Afghan border.
The US launched 46 attacks in 2012 in North Waziristan Agency while 72 strikes were carried out in 2011 and 122 in 2010. 10 of the 45 drone strikes in Pakistan, or 22%, have hit targets in the Shawal Valley. Targeting in the area was heavy this summer; at one point in time, seven of 10 strikes took place in the Shawal Valley.