In pictures: Washington Navy Yard shooting

Emergency vehicles at Washington site, 16 Sept

Dozens of emergency vehicles converged on Washington Navy Yard, the naval installation in the US capital, as news of a shooting emerged on Monday morning.

Law enforcement officials at the Washington Navy Yard, 16 Sept

Initial reports of the number hurt were hard to verify at the base, where as many as 3,000 people work.

Law enforcement officials near Washington Navy Yard, 16 Sept

Personnel at the yard were ordered to "shelter in place", the Navy said.

Law enforcement officials near Washington Navy Yard, 16 Sept

Law enforcement officials were deployed on rooftops to try to contain the situation.

A helicopter rescues an apparent victim of a multiple shooting at the Washington Navy Yard, 16 Sept

A helicopter rescues an apparent victim of the multiple shootings at the Navy Yard.

People come out from a building with their hands up after a shooting happened at the Washington Navy Yard (16 September 2013)

Later, workers at the yard were escorted from the facility with their hands up, as officials tried to empty the complex safely.

Law enforcement officials at the Washington Navy Yard, 16 Sept

President Barack Obama has been briefed by top officials and has directed federal agencies to co-ordinate their response efforts.

Onlookers outside the Washington Navy Yard, 16 Sept

Anxious onlookers gathered to await news of casualties.

Helicopters over the Washington Navy Yard, 16 Sept

The Washington Navy Yard is the US Navy's oldest shore installation, first opened in the early 19th Century.