A soldier from the U.S.-trained Afghan army apparently turned his weapon on U.S. troops in southern Afghanistan, killing at least two U.S. soldiers, NATO officials said Saturday.

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KABUL, Afghanistan — A soldier from the U.S.-trained Afghan army apparently turned his weapon on U.S. troops in southern Afghanistan, killing at least two U.S. soldiers, NATO officials said Saturday.

The incident is the latest that calls into question the allegiances of at least some members of the Afghan security forces, which the Obama administration hopes will be the key to an eventual withdrawal of roughly 100,000 U.S. troops from Afghanistan.

A NATO official, speaking on condition of anonymity, said the shootings took place late Thursday in southern Helmand province. The area has been the site of intense fighting between the Taliban-led insurgency and thousands of additional troops President Obama sent to Afghanistan this year.

Few other details of the clash were immediately available. CNN quoted a Taliban statement from a militant website as saying the Afghan soldier shot the U.S. troops on a U.S. base in Helmand’s Sangin district.

A spokesman for the Taliban in southern Afghanistan, Qari Yousuf Ahmad, claimed the soldier killed three Americans, not two, and sought refuge with the Taliban.

The shootings, if confirmed, would be the most recent in a series of turncoat attacks by Afghan soldiers on their NATO allies. In August in northern Badghis province, two Spanish police officers and their Spanish-Afghan interpreter were killed by an Afghan policeman, who officials said was a Taliban agent.

In July, also in Helmand province, an Afghan soldier shot and killed three British soldiers; Taliban insurgents claimed responsibility.

Last week, a squad of Afghanistan’s national police in Ghazni province, southwest of Kabul, was reported to have crossed sides to the Taliban, although the details of what occurred are murky.

The International Security Assistance Force said two other allied soldiers died in insurgent attacks Saturday, one in the country’s south and one in the east.

The violence came as a group of parliamentary candidates from across Afghanistan demanded a rerun of September’s elections, saying they’d been wrongfully disqualified, and promised new rallies to protest.

The move by a dozen candidates drawn from provinces in northern and central Afghanistan appeared unlikely to change the outcome of the Sept. 18 election, whose final results have not been announced. But it underscored the difficulty of achieving the U.S. goal of building a stable Afghan government.

The elections were marred by charges of vote-rigging, ballot-stuffing, intimidation and other problems. Afghanistan’s electoral body threw out 1.3 million of a reported 5.6 million ballots cast, without a clear explanation, and final results, originally due Oct. 30, have been delayed until at least late November.

A report by the Electoral Complaints Commission, dated Oct. 31, shows there have been more than 5,200 complaints of irregularities nationwide

“Your money, your effort, your blood, your sweat and your tears are spent in this country,” said Dawood Sultanzoi, a parliamentarian from Ghazni, who stands to lose his seat, unfairly, he said. “This will drive hundreds of thousands of people to the mountains to join the (Taliban) opposition,” and further hurt the U.S. counterinsurgency effort, he said.

Zakaria Barakzai, a member of the Independent Election Commission, which oversaw the voting, dismissed the complaints as coming from sore losers and said there would be no new election.

Material from The New York Times is included in this report.