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Washington DC’s Capitol Police have ordered a review into a BBC report that an armed police team was ordered not to respond to Monday’s mass shooting.

A tactical response team from the force was told by a supervisor to leave the scene instead of aiding municipal officers, police sources told the BBC.

The Capitol Police sources suggest they could have saved lives had they been allowed to go in. […]

About 8:15 local time (12:15 GMT), Alexis entered Building 197 at the installation and launched his attack.

Armed with a shotgun and a pistol he took from a guard he had shot, he sprayed bullets down a hallway and fired from a balcony down on to workers in an atrium. He also fired on police officers who stormed the building, and was later killed in the shootout.