KABUL, Afghanistan - Afghanistan executed 15 inmates by gunfire at its main prison outside Kabul, carrying out the death penalty for the first time in more than three years, the chief of prisons said Monday.

The mass execution took place Sunday evening according to Afghan law, which calls for condemned prisoners to be shot to death, said Abdul Salam Ismat.

Afghanistan's hard-line Taliban used to carry out executions in public, many of them at the war-shattered Kabul stadium, but the practice stopped after the regime was ousted from power by the U.S.-led coalition in late 2001.

The killings are the country's first state-sanctioned executions since April 2004. Amnesty International said after the 2004 execution that President Hamid Karzai had assured the group there would be a moratorium on the death penalty.

Karzai's spokesman, Humayun Hamidzada, refused comment Monday, saying there would be an announcement on state TV Monday evening. Last week, Hamidzada told The Associated Press that Karzai "takes extreme care in execution cases."

"He has been holding on to these cases because he wants to make sure that the justice is served and the due process is complete. He personally does not like executions, but Afghan law asks for it, and he will obey the laws," he said.

The mass executions are likely to complicate the relationships some NATO countries with military forces here have with Afghanistan. International troops often take militants prisoner and later hand them over to the Afghan government, but some countries will not be allowed to do that if Afghanistan is known to carry out capital punishment.

In violence Monday, 16 militants fighting under a wanted Uzbek warlord with a $200,000 bounty on his head were killed in airstrikes in eastern Afghanistan.

Separately, an Afghan child who apparently walked onto a NATO training site was killed, officials said Monday.

A roadside bomb killed a soldier in the NATO-led force in Uruzgan province, said Maj. Charles Anthony, spokesman for NATO's International Security Assistance Force. Australian and Dutch troops make up the majority of troops in Uruzgan.

Also in Uruzgan, two Dutch Apache helicopters were hit by enemy fire Monday, the Dutch Defense Ministry said in a statement. Both landed safely and their crews were not injured. The helicopters supporting to ground troops when they were hit in the rotor blades. Dutch forces based in Tirin Kot have five Apache helicopters.