Construction work at the World Trade Center was partly shut down Thursday for an investigation after a crane dropped metal beams 40 stories, damaging a flatbed truck.
The Tishman construction company says no one was hurt in the accident.
Tishman says a cable on the crane snapped at around 10 a.m. The truck had hauled the steel into the lower Manhattan site.
Construction worker Frank Pensabene heard a loud crash. He says: "Everybody was yelling and running."
Tishman says it is investigating the matter along with the fire and buildings departments, and the Port Authority, which owns the site.
There were some subway disruptions for about an hour.
The accident occurred inside the construction zone at Four World Trade Center.