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The white male in the tan outfit has been identified and is not a suspect  or person of interest

D.C. Mayor Vincent Gray said at least 12  people were killed in the Navy Yard rampage as D.C. Police Chief Cathy Lanier revealed one shooter was killed at  the scene and authorities are looking for another man — after a third was  cleared of involvement in the attack.

NBC first identified the slain gunman as Aaron  Alexis, a 34-year-old man from Texas. He was a civilian contractor who  reportedly stole a military ID to gain access to the Navy Yard.

A senior federal law enforcement official said authorities were investigating  whether the main shooter was motivated by a dispute with employees at the Navy Yard.

Authorities were still clearing the building early Monday afternoon.

The two at large suspects were dressed in military garb but are not believed  to be U.S. service personnel, Lanier said.

One was a young white man in a khaki like uniform and the other was a black  man in his 50s with a long rifle in an olive colored garb, she said.

UPDATE: The D.C. Police  Department tweeted the white male in the tan outfit has been identified and  is not a suspect or person of interest.

Earlier, Navy Capt. Ed  Buclatin said all the injuries occurred in Building 197 of the Navy Yard, which is home to the Naval  Sea Systems Command.

Navy officials had reported shots were fired at  8:20 a.m. at the headquarters of the Naval  Sea Systems Command in Southeast Washington.

D.C. police quickly deployed an “active  shooter team” within seven minutes of reports of shots fired, Ms.  Lanier said.

Two of the shooting victims are D.C. police officers.

Omar Grant, a civilian worker at the Navy Yard said he was on the first floor of the  five-story atrium when he heard the first shot. “At first I didn’t know if  someone dropped something,” Mr Grant said. “It echoes in an atrium.”

Then he heard the other shots, Mr. Grant said.

“It was unmistakable,” he said. “Nobody had dropped anything. Those were  shots.”

The Navy has issued a shelter-in-place order for  personnel, Pentagon Press Secretary George  Little said.

“We believe there has been loss of life and several injuries,” Little  said. “We continue to monitor this ongoing situation.”

George Washington University Hospital has confirmed that a 60-year-old male  was killed in the Navy Yard shooting Monday  morning.

A spokesman said the man, whose name was not given, was dead on arrival to  the hospital at around 9  a.m, about 40 minutes after the shooting.

The spokesman said the man was shot in the left temple and the wound was “not  survivable by any stretch.”

The hospital said it  was told to be prepared to take more victims of the shooting.

A spokeswoman for Medstar Washington Hospital Center  said the D.C. hospital has already received three people wounded in Monday’s  shooting at the Navy Yard and “we’ve been told to  expect more.”

Chief Medical Officer Janis Orlowski said one D.C. police officer was already in  surgery. The three shooting victims — one man and two women — have “a good  chance of survival.” One of the women had been shot in the hand and head, she  said.

Ms. Orlowski told reporters she did not  know if any other victims of the shooting would be transported to the hospital.  She said Medstar officials have been in touch with other hospitals in the area  to coordinate treatment of victims.

The rampage plunged D.C. into chaos during the morning commute.

The 11th Street Bridge was shut down, and people were routed away from the  area, the police spokesman said.

Flights departing from Ronald Reagan Washington National Airport were  stopped, the FAA said, and incoming flights are being held at their origin.  Flights resumed shortly after 11 a.m.

At the Capitol, the Senate came into session as scheduled at 2 p.m. but then  adjourned, postponing all business until later in the week.

“In light of the events at the Navy Yard area  today, we’ve decided to recess the Senate until tomorrow morning,” Senate  Majority Leader Harry Reid said.

At least nine D.C. public schools in the area went into lockdown.