Days after a final steel beam was put in place at 4 World Trade Center, a construction accident occurred when a crane broke some windows of the building.
The fire department said no injuries were reported. About 60 firefighters are at the scene. They are securing the area and clearing glass and debris.
The crane apparently shifted as a beam was being lifted to 4 World Trade Center and it hit windows on the 45th and 46th floors around 11:30 a.m. on Wednesday.
Tishman Construction, the company managing the construction project, said "a sudden gust of wind" caused the beam hit a glass panel on the south side of 4 World Trade Center, and glass fell onto Liberty Street.
The company added it will inspect the building's facade and review safety protocols.
The September 11 Memorial plaza was evacuated. The Office of Emergency Management said the memorial will remain closed for the rest of the day.
Additionally, several streets around the site have been closed to pedestrian and vehicular traffic, including Trinity Place from Thames Street to Cortland St. and Liberty, Cedar and Thames streets between Broadway and West Street.
The 72-story skyscraper is expected to be the first to open at the site since the terrorist attacks in 2001 destroyed the Twin Towers.
Annmarie Fertoli contributed reporting.