Three 60-foot steel beams fell 40 stories at the World Trade Center construction site Thursday after a crane cable snapped. Authorities said no one was injured when the beams -- each weighing several tons -- came hurtling down from one of the new towers being built at the site of the September 11, 2001, terrorist attacks. "The cable of a crane broke, causing the steel it was lifting to fall approximately 40 stories back onto the flatbed truck that had transported the steel into the World Trade Center site," said a statement from John Gallagher, spokesman for Tishman Construction, which manages the site.