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 U.S.-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.
Al-Qaida and Taliban militants have found safe haven in parts of the border region since the 2001 U.S.-led invasion of Afghanistan, attacking both American troops in Afghanistan and targets inside Pakistan.
In recent days, the Pakistani army has launched attacks against insurgent hideouts in the country's northwestern Bajur tribal region. The mountainous region borders Kunar province.
Meanwhile, NATO said Friday that a bomb attack in southern Afghanistan had killed a coalition service member. The coalition said that the service member died Thursday. NATO provided no other details.
Thirty international troops have died so far this month as the Taliban continues its spring offensive in Afghanistan to regain ground lost during the winter. Fighting has killed 236 coalition members this year.
Associated Press writer Jon Gambrell contributed to this report.