Reporting from Kabul, Afghanistan -- As the Red Cross confirmed Wednesday that dozens of civilians had been killed in U.S. airstrikes in an isolated district in western Afghanistan, provincial authorities suggested the toll could reach 100. Weeping villagers dug mass graves.

The incident, which appeared to be the most lethal episode in many months involving Afghan civilians accidentally killed by Western forces, cast a pall over Afghan President Hamid Karzai's first meeting in Washington with President Obama. Karzai, in a statement issued by the presidential palace in Kabul, called the deaths "unacceptable."

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