It's the latest in a barrage of attacks by unmanned drones on the stronghold of Taliban fighters targeting American and Nato forces in Afghanistan. – File Photo

MIR ALI: Pakistani intelligence officials said a suspected US missile strike killed four alleged militants in the country's northwest.

It's the latest in a barrage of attacks by unmanned drones on the stronghold of Taliban fighters targeting American and Nato forces in Afghanistan.

The officials said a pair of missiles hit a moving vehicle in Pir Kali village in North Waziristan. The area is home to a mix of Afghan and Pakistani Taliban.

The two Pakistani officials spoke on condition of anonymity because they were not authorized to talk to the media.

The US has ramped up its officially unacknowledged drone attacks in Pakistan's lawless border region, launching more than 100 missile strikes this year. – AP