NYC 9/11 rescuers experience lingering health problems

Nearly 3,000 people died in the terrorist attack on the World Trade Center in New York on September 11, 2001. But the twin towers' collapse and their smoldering ruins also exposed thousands of rescuers, firefighters and cleanup crews to toxic ash and smoke. Ten years later, medical researchers say many of these people are suffering higher-than-normal rates of serious disease and psychological problems.