NEW YORK - Authorities say a fire on the 88th floor of the New York City skyscraper under construction at ground zero is likely a false alarm.

Steve Coleman, a spokesman for the Port Authority of New York and New Jersey, which owns the site, says the fire report was called in by a member of the public Wednesday and is believed to be a false alarm. The report was thought to be related to welding at One Word Trade Center.

The fire department says the situation "probably will hold."

Last week, a steel beam signed by President Barack Obama was lifted into place at the top of the 104-story skyscraper that's being built to replace the twin towers destroyed in the Sept. 11 attacks. It's expected to be completed in 2014.