A second US drone attack in a Pakistani tribal region near the Afghan border on Wednesday has killed four militants, officials say.
The missile attack targeted the militants' vehicle, AFP reported.
Earlier on Wednesday, at least ten people were killed in another US drone attack in the same region when two missiles were fired by a US drone at a suspected militant compound.
The aerial raids in Pakistan, initiated by former US president George W. Bush, have been escalated under President Barack Obama.
Washington claims the strikes target militants. However, the attacks, conducted by CIA in coordination with the Pentagon, have reportedly killed some 1,000 Pakistanis over the past two years.
The issue of civilian casualties has strained relations between Islamabad and Washington. Pakistan has repeatedly condemned the attacks as a violation of its sovereignty.