Close-up of bullets on the ground left by a US soldier who shot Afghan civilians.
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US Afghan accused 'not healthy' - lawyer John Browne

16 March 2012 Last updated at 05:39 GMT

More details are emerging about the US staff sergeant accused of killing 16 Afghan civilians, including women and children.

Through his lawyer the BBC has learnt that, the day before the killings, the soldier may have witnessed one of his friends being seriously injured, and that he suffered a head injury when he was serving in Iraq.

The BBC's Jonathan Blake reports from Washington.