Officials say one Pakistani soldier was killed when Afghan and Pakistani troops exchanged fire across the border today.
In Pakistan's northwestern city of Peshawar, a senior military official said Afghan forces fired on Pakistani military checkpoints, killing one Pakistani soldier and injuring three.
A border police commander in Afghanistan's eastern province of Khost confirmed the exchange of fire and accused Pakistan of starting the battle.
It was the most serious cross-border clash between Afghan and Pakistani troops since May 2007, when three civilians and a policeman were killed.
compiled from agency reports