Two separate attacks carried out by suspected drones have killed at least 13 militants in north-west Pakistan, local officials said.
The missiles struck an hour apart near the town of Miran Shah in the North Waziristan tribal region on Sunday
The lawless region, a haven for members of the Taliban and al-Qaeda, has been repeatedly targeted by US drones.
More than 70 drone strikes have killed over 200 people in North and South Waziristan since the start of 2010.
In the first strike, officials say, missiles struck a house and a vehicle in the town of Ghulam Khan, north of Miran Shah, the main town in North Waziristan. Nine militants were killed in this attack.
The second attack happened an hour later when missiles struck a car in the neighbouring town of Datta Khel, killing at least four suspected militants, officials said.
Pakistan publicly criticises drone attacks, saying they fuel support for militants. But observers say officials privately condone the strikes.
The US military and CIA do not routinely confirm that they have launched drone operations, but analysts say only US forces have deployed such aircraft in the region.