A security guard at the Smithsonian's Hirshhorn Museum and Sculpture Garden died of a self-inflicted gunshot wound Monday.



The guard shot himself with his service revolver shortly after 3 p.m. Monday in a locker room in the basement level of the building, Smithsonian Institution officials said. The public did not witness the shooting, and no one else was injured.



The museum on the National Mall was evacuated and closed for the rest of the day. The Hirshhorn is the Smithsonian's modern art museum.



The guard's name has not been released.



D.C. police are investigating.