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Some 13,000 US soldiers stay in Afghanistan.
United States and Afghan troops have actually come under direct fire in eastern Afghanistan, and there are reports of casualties.
United States officials state it is unclear whether militants in Afghan uniforms assaulted the US forces in Nangarhar province or whether there was an argument between the allies.
An examination is now under method.
Some 13,000 United States soldiers stay in Afghanistan after the US intervention to oust the Taliban follo