Navy Yard: Swat team 'stood down' at mass shooting scene...

One of the first teams of heavily armed police to respond to Monday's shooting in Washington DC was ordered to stand down by superiors, the BBC can reveal.

A tactical response team of the Capitol Police, a force that guards the US Capitol complex, was told to leave the scene by a supervisor instead of aiding municipal officers.

The Capitol Police department has launched a review into the matter.

Aaron Alexis, 34, killed 12 people at the Washington Navy Yard.

"I don't think it's a far stretch to say that some lives may have been saved if we were allowed to intervene," a Capitol Police source familiar with the incident told the BBC.

A former Navy reservist, Alexis was working as a technical contractor for the Navy and had a valid pass and security clearance allowing him entry to the highly secure building in south-east Washington DC. Full story...

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