At least four alleged militants were killed early Saturday when a US drone fired on a compound in north-western Pakistan, security officials said.
Another six people were injured in the strike, which took place at 1:30 am (2030 Friday GMT) in Barmal, South Waziristan, one of the seven restive tribal districts along the Afghan border.
"Three drones were seen flying in the area and four missiles were fired at the house," said a Pakistani intelligence official who spoke on condition of anonymity.
"According to the initial information, four people were killed and six injured. All of them belong to the Mullah Nazir group."
The information cannot be verified through independent sources, as the area is inaccessible to the media and aid workers.
Mullah Nazir is believed to be a Taliban group that has agreed not to attack Pakistani security forces but conducts raids against NATO troops across the border in Afghanistan.
It was the fourth drone attack in three days against militant hideouts in Pakistan's rugged tribal region, and the second in South Waziristan.
The previous three strikes killed twelve members of the Haqqani group, a Pakistan-based part of the Afghan Taliban with links to al-Qaeda, officials said.
The group is thought to be behind several recent attacks, including the September siege on the US Embassy and NATO offices in Kabul.
Since 2008, the US has escalated its strikes by unmanned aircraft on Taliban and al-Qaeda militants using Pakistan to attack international forces in Afghanistan.