15 militants killed in clashes in northwest Pak
The attack was the latest in a string of assaults blamed on Pakistani Taliban based in Afghanistan.
Reports said the clash occurred near the Afghan border in Upper Dir district of Khyber-Pakhtunkhwa province.
Two security personnel were injured in the clash, which broke out at Karakar village, located close to the border.
The fighting began when militants fired at soldiers patrolling a road, an official told the media.
Taliban spokesman Sirajuddin Ahmad, who contacts reporters in northwest Pakistan from Afghanistan, has claimed responsibility for most of the cross-border attacks and bomb blasts in Malakand division.
He is close to Maulana Fazlullah, the former head of the Tehrik-e-Taliban Pakistan in the Swat valley.
Fazlullah, also known as Mullah Radio, fled to Afghanistan after Pakistani troops launched an operation against militants in Swat and Malakand in 2009.
A large number of soldiers were deployed in Upper Dir and Chitral areas last month following cross-border attacks by the Pakistani Taliban.
During a search operation on Saturday, security forces killed four militants in Charbagh and Mangaltan areas of Swat district.
An army officer was injured during the exchange of fire with the militants.