A security guard is dead after a gunman opened fire at a Federal building in Lower Manhattan.

Police say the gunman is identified as 68-year-old Kevin Downing of Fort Lee, New Jersey.

After entering the lobby, Dowing approached the metal detectors and shot a security guard at close range with a handgun. He then walked through the metal detector and fatally shot himself in the head with the same gun.

The security guard was rushed to the hospital where he died.

At this point, police don't know the motive for the shooting.  An investigation is ongoing.  {Metro Networks Inc)

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