Remembering 9/11, 23 years later

On Sept. 11, 2001, al Qaeda terrorists hijacked four commercial airplanes and crashed them into the World Trade Center towers, the Pentagon, and a field near Shanksville, Pennsylvania. Nearly 3,000 people were killed in the attacks. This year also marks a dark milestone: more New York first responders have now died from post 9/11 illnesses than died on the actual day of the attack. CBS News New York's Christina Fan leads our team coverage.