BBC News, Washington - 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...