FBI agents visited the offices of the conservative Weekly Standard magazine yesterday after a shooting at the Holocaust Memorial Museum and told employees they'd found the magazine's address A senior Standard staffer confirmed the visit but declined to discuss it in detail. An FBI spokeswoman, Katherine Schweit , also declined to comment on the investigation. Two other sources said two FBI agents arrived shortly after 5:00 p.m. Thursday at the 17th Street offices of the magazine. They told staffers that they had found the address of the magazine on a piece of paper associated with the shooter, James von Brunn,...