Pakistani intelligence officials say a suspected U.S. missile strike by a drone aircraft has killed at least four people near the Afghan border, AP reported.
The officials say some people have also been wounded in Saturday's attack in the South Waziristan tribal region.
They say intelligence agents are trying to get more details.
The officials spoke on condition of anonymity because they were not authorized to talk to the media.
Pakistan is a key ally of the United States in its fight against terrorism, but it has opposed missile strikes in the country's tribal regions where Taliban and al-Qaida insurgents are believed to be operating.
The U.S. has launched more than 30 missile attacks in recent months.