A crane lifting a beam struck several floors at 4 World Trade causing windows to shatter, said FDNY officials.
Pedestrians below were sent running for cover late Wednesday morning.
Glass and debris rained down on the area near the 9/11 memorial park. No injuries were reported.
The 9/11 Memorial posted a message on its website apologizing for the closure. It suggested that people who were scheduled to visit on Wednesday reschedule their visit.
The final steel beam at 4 World Trade Center was raised earlier this week.
On Tuesday, a worker was seriously hurt at the WTC construction site when he was impaled on some rebar, said FDNY officials.
The 37-year-old man fell about four to five feet.
The worker suffered a puncture wound on the left side of his torso by the two inch thick rebar.
Medics brought the worker to Bellevue Medical Center where he was listed in serious condition.
If you have photos from the scene you can email them to fox5video@gmail.com .
© 2004-2012 LSN, Inc. All Rights Reserved.Story posted 2012.06.27 at 02:50 PM EDT