A Pakistani soldier was killed and another wounded Sunday afternoon when an explosive device was detonated beneath a military convoy in Pakistan's North West Frontier Province Sunday afternoon, a Pakistani military official told CNN .
Militants and Pakistani soldiers exchanged fire after the explosion, the official said.
Search operations were underway to locate suspected militants, he added.
The Swat Valley, where the attack occurred, was once among Pakistan's biggest tourist destinations.
But in recent months, militants have unleashed a wave of attacks across the region that have claimed hundreds of lives, many of them security personnel.