Washington Navy Yard shooting: Workers react
16 September 2013 Last updated at 20:53 BST
At least 12 people have been killed in a shooting Monday morning at a naval installation in Washington, DC, including a police officer.
The attack happened at Washington Navy Yard in the south-east of the capital, and the area around the scene was put under lockdown.
The BBC talked to workers and onlookers in the area about the mass shooting.