The U.S Holocaust Memorial museum is back open after a day of mourning for a slain security guard.

Hundreds of people entered the museum Friday morning as it re-opened to the public.

The museum had been closed to mourn a guard authorities say was shot to death by an elderly white supremacist Wednesday.
    
James von Brunn, 88, has been charged with murder in the death of guard Stephen T. Johns.
    
Brunn himself remains hospitalized in critical condition, after being shot in the face during the attack.