(BBC) — 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.

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