Staged Evacuation To Be Filmed in Lower Manhattan

Police officials are warning residents and workers of Lower Manhattan to keep their cool today if witness thousands of people running in panic near the Brooklyn Bridge during rush hour. It's not real, police assure, it's just a movie.

"I Am Legend," a science fiction thriller starring Will Smith as the last man in Manhattan who is not infected by a virus that turns humans into nocturnal mutants, begins filming a large-scale evacuation scene near City Hall today.

While the police department generally issues advisories only about real crises, not mock evacuations, a police spokesman, Deputy Commissioner Paul Browne, said, "there's potential for it to generate some public concern." A mock black hawk helicopter, a coast guard helicopter, and a New York Police Department helicopter will begin circling the area today around 4 p.m.