NATO returns fire following attack from Pakistan

Afghan refugees are seen through the window of a car, heading back to their villages after the recapturing of Argandab district by NATO and Afghan troops from the Taliban militants, in Arghandab district of Kandahar province south of Kabul, Afghanistan on Saturday June 21, 2008. (AP Photo/Musadeq Sadeq)

KABUL, Afghanistan—NATO says its forces have launched artillery across the Afghan border at attackers who fired at them from Pakistan.

A military statement said three rounds of "indirect fire" landed near a NATO base in Afghanistan's Paktika province Saturday. Three more landed in an Afghan army compound. No casualties were reported.

It said NATO forces determined that the rounds were fired from inside Pakistan and returned artillery fire.

It said Pakistan's military was notified immediately after the initial attack.

Relations between Pakistan and foreign forces in Afghanistan were strained earlier this month after a U.S. airstrike along the Afghan-Pakistan border that Pakistan says killed 11 of its troops.

U.S. Secretary of State Condoleezza Rice has expressed regret over the incident, though it remains unclear why the Pakistani base was struck.