Washington Navy Yard shooting
Key Points
A gunman has killed at least 12 people at the Washington Navy Yard, a naval installation in the US capital, officials say
Police were called to the scene after reports of shooting at 0820 local time (1320 GMT)
Police say a gunman was killed at the scene, and two "potential" suspects wearing military-style uniforms may still be at large
US President Barack Obama has promised to make sure "whoever carried out this cowardly act is held responsible"
All times in GMT
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Reports and reaction
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Reporters: Tom Geoghegan and Zoe Murphy
link-
http://www.bbc.co.uk/news/world-us-canada-24114927