4 US soldiers killed in Afghan attack

It said the arrests came during a continued assault by US soldiers against insurgents in the Pech Valley of restive Kunar province, where Sunday's deadly attack took place.

"The coalition's response has resulted in the detention of 11 insurgents believed responsible for the attack," a US military statement said, adding that the hunt was in progress for other rebels.

"Operations to kill or capture other extremists, deny them sanctuary, and restore stability to the area are continuing," it said.