(CBS/AP) NEW YORK - Firefighters responded to the 89th floor of One World Trade Center on Saturday morning to help construction workers put out a small fire in some wooden decking.
CBS Station WCBS reports the Fire Department got the call for help at 7:15 a.m.
Workers at the unfinished tower extinguished most of the burning wood themselves, but firefighters were still on the scene wetting down the area an hour later.
The floor has been charred by the flames, and smoke could be seen for miles, the FDNY said.
Construction has been halted at the site until the FDNY figures out what caused the blaze.
The skyscraper is already more than 1,200 feet high, with a few hundred feet more to go until it reaches its full height.
White House spokesman Josh Earnest said President Barack Obama will visit the site of the Sept. 11 attacks in New York City on June 14, where he will get a briefing on the progress of construction on One World Trade Center.
The tower, previously known as Freedom Tower, has surpassed the Empire State Building as New York's tallest skyscraper.