Latest: Navy Yard Cleared, No Shooter Found

UPDATE: It appears this was a false alarm:

BREAKING: Official: No evidence of shooting, no arrests, no weapons after report of shots at Navy Yard.

— The Associated Press (@AP) July 2, 2015

UPDATE: Navy Yard officials now say a shooter has not been spotted and there are no casualties.

The Navy Yard in Washington D.C. has been locked down after shots were fired inside a building. Authorities are reporting there is an active shooter in the area. At this time there are no reports of casualties or injuries. 

#BREAKING: #NavyYard lockdown/shelter continues. No further info at this time. More to follow.

— U.S. Navy (@USNavy) July 2, 2015

#BREAKING: @CNICHQ @NavalDistWash #NavyYard lockdown/shelter in place. Investigation continues. No further info at this time.

— U.S. Navy (@USNavy) July 2, 2015

More: @JamesRosenFNC alerts us to State Dept memo confirming report of "active shooter" at #NavyYard at 8:01am this morning @foxandfriends

— heather nauert (@heatherfoxnews) July 2, 2015

Earlier this week the FBI and Homeland Security issued a joint memo heightening security awareness and warning against lone wolf terror attacks over the July 4 weekend.

In 2013, the Navy Yard was attacked by a mentally ill man who killed twelve people.

More to come...

This post has been updated with additional information.