Policemen stand guard outside the home of Cathleen Alexis
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US Navy Yard gunman's mother: 'My heart is broken'

Cathleen Alexis, the mother of US Navy Yard gunman Aaron Alexis who killed 12 people, has said her "heart is broken".

Her comments come as 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.