(CNN) -- A suspected U.S. drone strike killed three alleged militants in Pakistan's tribal region Tuesday, intelligence officials in Pakistan said. The suspected drone fired two missiles on a vehicle believed to be carrying militants in the area of Angoor Adda of South Waziristan, one of the seven districts of Pakistan's volatile tribal region bordering Afghanistan, two intelligence officials said. It was the 22nd suspected U.S. drone strike in Pakistan this year, compared with 111 in all of 2010, according to a CNN count. The intelligence officials asked not be named because they were not authorized to speak to the media. Journalist Nasir Habib contributed to this report .
The suspected drone strike was the 22nd this year, according to a CNN count . It killed three suspected militants in Pakistan's tribal areas, intelligence officials said .