NEW YORK (AP) _ A 28-year-old man climbed over restraining fences and leaped to his death from the 86th-floor observation deck of the Empire State Building, police said Saturday.

Michael Ikenson, of Brooklyn, scaled the double fence at about 11 a.m. Friday and ''stood for one minute before jumping,'' said police spokesman Norris Hollomon.

He landed on a 21st floor ledge, he said.

Police did not know why Ikenson jumped, Hollomon said.

A security guard at the Empire State Building, which for decades was the tallest in the world, said that on average ''four or five people'' jump to their deaths from the skyscraper every year.

''Some years we have more, other years we don't have any,'' said the guard, who declined to give his name.

The building has an enclosed and open-air observation deck at the top, the 102nd story, which is 1,471 feet above street level. There is also an outdoor deck at the 86th floor, 1,250 feet up, said the guard.