The US mission in Afghanistan will "likely result in failure" unless troops are increased within a year, the top general there has said in a report.
Gen Stanley McChrystal made his assessment in a copy of a confidential report obtained by the Washington Post.
He recently called for a revised military strategy in Afghanistan, suggesting the current one is failing.
More than 30,000 extra US troops have been sent to Afghanistan since May - almost doubling the US contingent.
The number of US troops in Afghanistan is already set to rise to 68,000 by the end of the year.
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