Shots have been reported in a building on the Washington Navy Yard campus, an official has said.
Navy spokesman Petty Officer 1st Class Pedro Rodriguez said that a lockdown is underway.
The Navy Yard, in south-east Washington, is the country's oldest naval installation.
UPDATE: DC Fire Department says no injuries at Washington Navy Yard amid reported shooting - Local CBS Affiliate pic.twitter.com/3onPazftYr
— The Adam's Corner (@TheAdamsCorner) July 2, 2015
A heavy police and fire department presence begins blocks away from the Navy Yard, with roads blocked off and a helicopter hovering overhead.
In September 2013, military contractor Aaron Alexis