Americans remember the lives lost in the 9/11 attacks 25 years ago

Families, survivors, first responders and dignitaries marked the 25th anniversary of the 9/11 attacks with somber and poignant ceremonies. That included major gatherings in New York, at the Pentagon and in Shanksville, Pennsylvania. The attacks killed 2,977 people and set the country on a course that would define the next quarter-century. Geoff Bennett reports.