US drones struck a compound in the restive North Waziristan tribal region of northwest Pakistan on Sunday, killing at least four militants, officials said.
The spy plane fired three missiles at the compound in Tablai Tal area, 30 km north of Miranshah, a key town in North Waziristan.
It could not immediately be ascertained if any foreigners were among the four militants killed in the attack, officials said.
The US has stepped up drone strikes in North Waziristan to flush out al-Qaeda and Taliban elements that target US-led allied forces across the border in Afghanistan.
Hundreds of people have been killed in dozens of drone attacks since January.
Four militants were killed and five more injured in a drone attack on Saturday.