This Tweet awoke the entire world to the fact that something might be taking place at Washington DC’s Navy Yard:
#BREAKING: @NavalDistWashington Navy Yard on lockdown/shelter in place. No incident can be confirmed as of yet. More to follow.
— U.S. Navy (@USNavy) July 2, 2015
An unconfirmed report of an active shooter triggered the lockdown, but a law enforcement source has said that they have found no evidence of any gunman yet.
The source said the original 911 call reported a shooting on the second floor. The source confirmed that the Metropolitan Police and multiple law enforcement agencies are checking for a person with a gun in the building. (CNN)
The investigation is in progress. Individuals nearby have taken to twitter to share photos of what is currently going on:
Officers standing outside 300 M st., which is located down street from Navy facility. #NavyYard pic.twitter.com/tJtMJwKxKQ
— Laura Barrón-López (@lbarronlopez) July 2, 2015
Heavy police presence remains in the 400 block of m at SE #navyyard @wmalnews pic.twitter.com/UOm1hN5tLP
— Heather Curtis (@HeatherMCurtis1) July 2, 2015
Some law enforcement pulling out. #NavyYard @fox5newsdc pic.twitter.com/Pp4RwDWuMu
— Jennifer Davis (@JenniferDavisDC) July 2, 2015
Apparently journalists have been asked to leave the area:
It's now clear. Just overheard that a briefing could come at 7th and M #NavyYard pic.twitter.com/88W579v030
— Nolan D. McCaskill (@NolanDMcCaskill) July 2, 2015
Some witnesses have reported that they didn’t hear any shots fired. Fox Business reports that the police are currently interviewing the 9-1-1 caller who originally reported the shooting.
Fox confirms police are interviewing source of original 911 #NavyYard call. Stay tuned to Fox Business for the latest pic.twitter.com/ZxHJEw5faR
— FOX Business (@FoxBusiness) July 2, 2015
We will update this story as more information comes in.
Update 10:00am EST:
Police have called an all-clear at the Navy Yard, and some law enforcement are leaving the scene.
fox5newsdc: RT fox5melanie: #BREAKING – US Capitol Police leaving #NavyYard scene pic.twitter.com/fNrehGYwoq
— Sendler Nies (@Cust_Service_) July 2, 2015
Civilian and military staffers are said to be returning to their buildings.
DC police: After report of shots, Navy Yard search complete; no evidence of shooting, injuries – @AP
— Breaking News (@BreakingNews) July 2, 2015
This appears to have been a false alarm. It will be interesting to see what triggered the 9-1-1 call.
Update 12:00PM EST
Press conference concluded. The 9-1-1 call turned out to not be a hoax, just a false alarm. It was an extremely smooth investigation process that, thankfully, concluded there was no dander to be had. 
