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A total of 14 NATO troops have been killed this month.

Last year was the deadliest of the nearly decade-long war for international troops, with more than 700 killed, compared with just more than 500 in 2009, which was previously the worst year of the fighting.

In central Afghanistan, an avalanche killed 16 people over the past four days. Fourteen of those killed were members of two families who died when their houses were crushed, said deputy police chief of Day Kundi province, Sayed Bakir Mortazawi.

He said the remote mountainous region where the avalanche occurred lacks adequate health care facilities and snowplows to clear the roads.

A year ago, 171 people died in an avalanche at the 12,700-foot Salang Pass, the major route through the Hindu Kush mountains that connects the capital to the northern part of the country. Hundreds of soldiers and police plowed through huge snowdrifts to clear two miles of road that was blocked when a series of avalanches on Feb. 8, 2010, sent tons of snow and ice crashing down onto hundreds of vehicles along a treacherous stretch of highway.

Separately in the capital, armed Afghan security forces, prosecutors and representatives of a special court forced their way into the Independent Election Commission and sealed a vote-counting center and a warehouse full of ballots, according to Abdullah Ahmadzai, the chief electoral officer of the IEC.

The incident was the latest in a dispute over a special tribunal, backed by Mr. Karzai, that is investigating allegations of fraud in last year’s parliamentary elections. While he hasn’t said so publicly, it is widely believed that Mr. Karzai is unhappy with the slate of winning candidates and thinks fraud reduced voter turnout among his fellow ethnic Pashtuns.

Mr. Ahmadzai said the group forced its way inside the building, defying his instructions for armed men to remain outside. Once inside, they sealed the data center, a huge hall where about 400 people have worked to count votes, and a warehouse where the results of 2,300 polling stations in Kabul are stored, he said.

Mr. Ahmadzai said he suspects two events triggered the incident. On Saturday, Afghan lawmakers called the special court unconstitutional and urged Mr. Karzai to disband it. On Sunday, Mr. Ahmadzai said, the IEC received a letter from the attorney general’s office demanding cooperation with the court.

Mr. Ahmadzai said the IEC will cooperate with criminal investigations linked to the election but added that complaints about alleged election fraud already have been probed, the election results have been certified, winning candidates have been seated in parliament, and the legislature has opened.

A statement from the Afghan attorney general’s office said only that officials with the special court and prosecutor’s office went to the IEC compound to seal ballot boxes and that the IEC had agreed to cooperate with the special court’s investigations. The statement said the special court was continuing its inquiry with the assistance of 14-member panel of legal, judicial, government and election officials.

Associated Press writers Amir Shah, Deb Riechmann and Adam Schreck contributed reporting.