One shooter is dead after opening fire Monday morning at the Washington Navy Yard and authorities are investigating the possibility of an additional shooter wearing a military-style uniform, Metropolitan Police Chief Cathy Lanier confirmed.

Thirteen people were killed including the shooter, Mayor Vincent Gray announced at a late afternoon press conference. No motive is known at this time.

“It doesn’t get much more serious than this,” Gray said.

http://youtu.be/S8SKkYNlQLU

Multiple news outlets identified Aaron Alexis, 34, as the deceased shooter. Originally of Fort Worth, Texas, Alexis recently began working at the Navy yard as a civilian contractor, NBC reports.

At approximately 2:45 p.m., DC police announced over Twitter that one of two possible additional suspects, a white male in a tan outfit, had been identified and “is not a suspect or person of interest.”

Officials said a suspect began shooting inside the Naval Sea Systems Command Headquarters building at 8:20 a.m. Approximately 3,000 people work in the building.

A “shelter in place” order was issued for Navy Yard personnel. At least six schools were on lockdown as a precaution in the D.C. area, according to CNN.

http://youtu.be/9OWvwJQlwQU

Speaking with reporters, Navy Commander and witness Tim Jirus said he saw a man get shot in the head right in front of him.

“We were standing in the alley,” Jirus said. “[The victim] told me there was a shooter in our building… I heard two more gunshots and he went down while I was talking to him.”

http://youtu.be/O6fSJ65MIxI

Jirus then fled the area. He said he didn’t get a look at the shooter.

SWAT crews as well as police from multiple local and federal agencies are on the scene. President Obama has been briefed “several times” about the shooting, Fox News reports.

Navy Yard Shooter Alleged Suspect Aaron Alexis

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