WASHINGTON, DC (RNN) - The Metro Police Department announced multiple dead bodies remained inside the building from the Washington Naval Yard shooting, and two suspects may still be on the loose.
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Police Chief Cathy Lanier did not give a specific number of dead from the incident, which happened around 8:15 a.m. ET. She said a Metro police officer engaged one of the gunmen, killing the suspect and getting injured in the process.
"We potentially have two other shooters that we have not located at this point," Lanier said.
She described one as a white male armed with a handgun in a khaki or tan military-style outfit - short sleeves with a beret hat. The other she said was a black male about 50 years old armed with a "long gun" and wearing an olive or drab colored military -style uniform.
"There is no reason to believe either of them are military personnel, but we do believe they may be wearing military uniforms," Lanier said.
Two Navy officials said at least six were killed after shooters opened fire at the Naval complex, according to the Associated Press.
A federal law enforcement official said one of the suspected shooters has died, according to the Associated Press. Ed Ziegler of the U.S. Navy told CNN that two shooters were down, but he did not specify if that meant the shooters were in custody or dead.
He also stated a shooter had been cornered by law enforcement.
Janis Orlowski, Chief Operating Officer of Washington Hospital Center, said they were treating three shooting victims, one a male DC police officer currently undergoing surgery. The other two were female civilians.
One of the women has a gunshot wound to her shoulder; the other female victim received a wound to her head and her hand. Orlowski said all three were expected to survive.
WJLA reported the number four deaths 10 others injured, based on information from a police representative. A defense official told the Associated Press that several had been killed with possibly 10 more injured.
According to the Washington Post official Twitter, a "lone gunman has barricaded himself in [a] room after shooting."
The U.S. Navy's Twitter account confirmed "several" people had been injured when someone opened fire around 8:20 a.m. ET.
CNN reported a metropolitan police officer and another member of law enforcement were among the victims, although they did not relay their conditions. The suspected shooter was a 6'0" bald, black male in black clothing, according to CNN.
"He was far enough down the hall, and we could see him aim the rifle at us," Terry Durham, a witness, told WJLA. "He fired at us as we ran down the hall."
Durham added it appeared the shooter was firing over their head. Other witnesses said the weapon looked like a rifle.
Scanner traffic from emergency responders indicated a "mass casualty" team was readying to perform triage at the scene. A U.S. Park Police helicopter could be seen removing people from the roof of a building.
DC Firefighters, Ladder 36, tweeted that an officer had been injured and removed from the scene; the severity of the injury was "unknown." Police scanners reported the officer had been struck twice in the leg.
"There is one confirmed injury," according to the Navy's initial statement. "Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel."
George Washington Hospital has confirmed to CNN one patient was brought to George Washington Hospital at 9:07 a.m. A Washington Hospital Center representative told Washington Post they received two victims for treatment.
Capitol, DC, and Military Police, as well as fire, ambulance and Emergency Response Team vehicles responded to the scene. The Naval Sea Systems Command's headquarters is the work place for about 3,000 people, according to the statement.
The organization is comprised of command staff, headquarters directorates, affiliated program executive offices and field activities. It is responsible for engineering, building, buying and maintaining ships, submarines and combat systems for the Naval fleet's operational requirements.
The Navy Yard is about 1.5 miles from the U.S. Capitol and 4.5 miles from the Pentagon. Also, it sits roughly 1 mile from the Washington Nationals' baseball field, where a game is scheduled for 6 p.m. Monday. A meeting place for family members is set up at the parking lot at the ball field.
Eight nearby schools were placed on lockdown, as well as Fort Myer, which is about five miles away in Virginia. A ground stop at Reagan National Airport has been lifted.
Fire crews from nearby Arlington County, VA and Prince Georges County, MD are filling in for Washington, DC, fire crews who are on scene.
The White House released a statement that President Barack Obama had been briefed several times about the situation at the Washington Navy Yard.
"The President directed his team to stay in touch with our federal partners, including the Navy and FBI, as well as the local officials," according to the statement. "We urge citizens to listen to the authorities and follow directions from the first responders on site."
Family members looking for information about their loved ones can call 202-433-6151 or 202-433-9713.
Multiple agencies are investigating the incident, including the Naval Criminal Investigative Service, DC Metro Police, and the FBI, which has the lead.
"I'm deeply shocked and saddened by the shooting this morning at the Navy Yard," said Secretary of the Navy Ray Mabus. "Our thoughts and prayers are with the victims and their families. I have complete confidence in our first responders, and I continue to be completely focused on this very difficult situation."