Update 4:20 P.M.
D.C. police say a Holocaust Museum guard, Stephen Tyrone Johns, and the alleged shooter, James von Brunn, were rushed to George Washington University Hospital.
Police have now confirmed that Johns has died.
Officials said they had assessed hundreds of online postings and calls to emergency lines, initiating about 40 threat probes since the murder of two NYPD cops
Pa. police say the culprit took the present -- a Mickey Mouse table and chair set -- from right under the family's tree