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In the south, two NATO service members were killed in a bomb blast, the military alliance said.

NATO said the troops were killed by a homemade bomb, but provided no further details. The nationalities of NATO deaths are not generally released until after the next of kin have been contacted.

This year is already the deadliest of the war, with more than 530 international forces killed. There are about 140,000 foreign troops in Afghanistan, including about 30,000 additional troops brought in under President  Obama’s surge strategy.

NATO said Sunday that an air strike following a cross-border attack on an Afghan National Security Force outpost in Khost province, near Pakistan, on Friday killed more than 30 insurgents. A follow up on Saturday resulted in several more insurgents killed. It said there were no NATO casualties.

The coalition also said it killed at least five insurgents during a clearing operation in Kandahar, the Taliban heartland in the south that remains particularly volatile.

The multiday operation was intended to impede the Taliban’s ability to move freely in the area and to disrupt its attempts to stage attacks. According to a NATO statement Sunday, the militants fought back with rocket-propelled grenades and machine-gun and small-arms fire. It said no Afghan or coalition troops were killed.

NATO said Sunday that two Afghan civilians riding a motorcycle were killed Saturday after failing to stop while approaching a security perimeter in Helmand province in the south.

It said the motorcycle driver briefly stopped but then ignored warnings and accelerated toward the security forces.

Associated Press writer Rahim Faiez contributed to this report.