A teenager has been arrested after sneaking into One World Trade Center, which is still under construction in New York City and is America's tallest building, and ascending its 104 floors to the antenna.

Justin Casquejo, 16, of Weehawken, New Jersey, was carrying his camera when he crawled through a small hole in the construction fence encircling the World Trade Center site in lower Manhattan shortly after 4 a.m. on March 16. He then clambered up scaffolding to enter the building, took an elevator to the 88th floor and climbed stairs to the tower's antenna.

A spokesman for the Port Authority, the public agency that owns the building, declined to address reports that the guard assigned to protect the skyscraper's upper floors was asleep at the time.