Pakistani troops say they killed 15 militants during a pre-drawn gunbattle near the border with Afghanistan on Sunday.
The fighting took place in the Mohmand tribal area, where the Pakistani military is trying to flush out Taliban insurgents.
Local officials say the clash began when at least 40 militants attacked a security checkpoint. Pakistani troops launched a counter-attack.
The United Nations says fighting between government troops and Taliban insurgents in Pakistan's northwest has forced tens of thousands of people to flee their homes.
The U.N. refugee agency predicts the number of displaced people could reach 90,000 by the end of the month.
Some information for this report was provided by AP, AFP and Reuters.
