In 1997, a gunman opened fire on the 86th floor observation deck of the Empire State Building, killing one tourist and wounding six others before fatally shooting himself.

Metal detectors and bag searchers have been standard at the 102-story skyscraper since the 1997 shooting.

Millions of tourists visiting New York ascend its heights to gape over the city from its observation deck, made famous in films such as "Sleepless in Seattle." It was 1933's "King Kong" that showed a giant ape clutching Fay Wray and fending off airplanes atop the tower.