KABUL: A rocket fired during fighting Friday in Pakistan's tribal region landed in eastern Afghanistan, killing four children in an area where militants launch attacks on US-led forces, officials said.

The rocket landed in Sirkanay district of Kunar province, an area where more than 100 rockets have landed in the last few days from across the border, provincial police chief Gen. Ewaz Mohammad said.

It was unclear who fired the rocket, though Mohammad said there had been Pakistani military airstrikes in the region.

An Afghan border police official, Gen. Aminullah Amarkhil, said a neighboring region of Pakistan had seen the military fighting there.