WorldCanadian 9/11 survivor looks back 25 years later

As the 25th anniversary of the 9/11 terrorist attacks approaches, Canadian survivor Brian Clark recalls the day nearly 3,000 people were killed after 19 hijackers seized four planes. Two struck the World Trade Center, one hit the Pentagon and another crashed in Pennsylvania. Clark was in his South Tower office at about 8:46 a.m. when he heard a noise, then escaped with a man he rescued.