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DEVELOPING: 13 dead, police searching for one more suspect in military garb

This story is developing:

UPDATE: WASHINGTON — The death toll from the shooting this morning at Navy Yard has risen to 13, after another victim died at the hospital, Mayor Vincent Gray told reporters at a press conference shortly after 4 p.m.

That number includes the gunman who was killed in one of multiple engagements with police. Gray estimated that there are “probably a dozen or more who are wounded,” not all from gunfire.

Police Chief Cathy Lanier confirmed that the suspected gunman was Aaron Alexis. FBI Assistant Director for the DC field office Valerie Parlave declined to say whether or not he had a military background or how he gained access to the Navy Yard.

Alexis’ picture has been released by the FBI and they are requesting any information on him.

Lanier described the shooting as “one of the worst things we’ve seen in Washington, DC.”

“We know these kinds of things have happened in other places in other cities in America, but nothing like this in the District of Columbia,” Gray said.

Police are looking for another man suspected of being involved in the shooting. A second man suspected of involvement has been identified and ruled out in the past two hours.

Gray said officials do not yet know the identities of all of the victims, and he said, “I don’t think we know” how the gunman got into the building.

See the FBI photo:

Aaron Alexis FBI

UPDATE: One of the men potentially involved in the shooting has been ruled out as a suspect, according to the D.C. Metropolitan Police Department’s official Twitter feed.

“The white male in the tan outfit has been identified and is not a suspect or person of interest,” they tweeted at 2:43 p.m.

WASHINGTON — At least 12 people were killed Monday morning during a shooting at Navy Yard around 8:30 a.m., Police Chief Cathy Lanier told reporters at a press conference.

Speaking shortly after 2 p.m., Lanier said they were still doing a search, and were not sure that they had yet accounted for all the victims.

Several other people were injured, but not fatally.

One police officer is in the hospital with a gunshot wound. Lanier said he is “currently being treated.”

She said police were still on the look out for two other men whom they believed were involved in the shooting. Both are dressed in military garb, but she said there is no reason to believe that either one of them is military.

The FBI has officially taken the lead on the investigation.

“We have no known motive at this stage,” said Mayor Vincent Gray at the press conference, adding that “at this stage” they did not have any reason to believe that it was a terrorist attack, but they were “continuing the investigation.”

Follow Alexis on Twitter