An armed veteran slipped through a side door of a federal building on Friday and shot a security guard in the head, killing him, before killing himself, police said.
Detectives were investigating what prompted the shooting of FJC Security Services guard Idrissa Camara, who was supposed to have gotten off work at 4 p.m. but agreed to stay on for an extra shift.
The shooter, Kevin Downing, entered through a side entrance of the Manhattan building, which houses an immigration court, a passport processing center and a regional office for the Department of Labor, police said.
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