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Law enforcement and U.S. Navy officials have confirmed that there was no shooting at the Navy Yard in Southeast D.C. Thursday.

“At this time there is no evidence of gunshots, there is no evidence of a shooter,” Mayor Muriel Bowser said at a press conference. “We are grateful at this point that we found no shooter evidence.”

According the Metropolitan Police Department, “a call was placed from a building inside of the Washington Navy Yard for possible sounds of gun shots around 7:29 a.m.” The call elicited a massive law enforcement response to the site, which was the location of a deadly mass shooting in 2013.

“At this time we have completed our search of the building and have found no evidence of a shooting or injured personnel,” MPD said. A U.S. Navy official said the Navy Yard is still under lockdown, but it will reopen once a search is completed.

MPD Chief Cathy Lanier said the response to today’s call of a “potential active shooter” was “well coordinated.”

Lanier added that she was not concerned that the call was a hoax.