A gunman opened fire inside a military building at the Washington Navy Yard Monday morning, leaving 13 people dead. At least four people were wounded, including a law enforcement officer.
"We are continuing to try to ascertain how serious this situation is," Washington D.C. Mayor Vincent Gray said. "Though it doesn't get much more serious than that obviously."
The shooting suspect has been identified by authorities as former Navy reservist Aaron Alexis, 34, who served from 2007-2011. Alexis was killed during the rampage.
Is the Navy yard shooting an act of terror? CBN News' Terrorism Analyst Erick Stakelbeck answers this and more, on CBN Newswatch, Sept. 16.
Meanwhile, police are looking for one more potential gunman wearing military-style attire.
"The big concern for us right now is that we potentially have two other shooters that we have not located at this point," Washington Police Chief Cathy Lanier told reporters.
"We have no information to believe that either of those folks are military personnel, but we do have information that those individuals are wearing military-style uniforms," she said.
The incident began unfolding at approximately 8:20 a.m. at the headquarters of the Naval Sea Systems Command where gunshots were heard.
"I was on the phone and somebody came around my desk and said, 'Hey, this is not a fire alarm. Somebody has been shot in the building,'" Todd Brundage, a Navy Yard employee, recalled. "So we went around trying to get people out of the building. And as we were exiting the back door, we noticed him down the hall. He stepped around the corner, we heard shots."
Another witness, logistics management specialist Patricia Ward told reporters, "It was three gunshots straight in a row - pop, pop, pop. Three seconds later, it was pop, pop, pop, pop, pop, so it was like about a total of seven gunshots."
"Everybody just panicked at first," she said. "It was just people running, running, running."
The scene was filled for blocks with hundreds of police cars, fire engines and emergency vehicles.
"I noticed a lot of intersections were shut down and people were putting on their sirens on," D.C. Resident Josaphat Plater-Zyberk said. "There were all different types of vehicles, big black SUV's, white DC government cars, and everything in between."
WJLA reports three of the victims, including the police officer, were being treated at MedStar Washington Hospital Center. The fourth died of a gunshot wound to the head.
Meanwhile, President Barack Obama is extending his condolences to the vicitims' families and vowing to do everything necessary to catch those responsible.
"I have made it clear to my team that I want the investigation to be seemless, so that local and federal authorities are working together," he told reporters Monday. "And as this investigation moves forward, we will do everything in our power whoever carried out this cowardly act is held responsible."
"In the meantime, we send our thoughts and prayers to all at the Navy Yard who've been touched by this tragedy," he said.