At least 12 people are dead following a shooting rampage at the Washington Navy Yard. While one of the suspected shooters has been killed, D.C. Police Chief Cathy Lanier explains: “The big concern for us right now is that we have potentially two other shooters that we have not located at this point.” Follow along with the latest details at CNN.

+ Here are some photos from the scene, and some background on the Washington Navy Yard.