Canadian survivor of 9/11 looks back 25 years later

This week marks 25 years since the 9/11 terrorist attacks on the United States. Close to 3,000 people were killed when 19 hijackers commandeered four planes. Two were flown into the World Trade Center, one into the Pentagon and a fourth crashed in a field in Pennsylvania. Around 8:46 a.m. on Sept. 11, 2001, Brian Clark was in his office in the South Tower of the World Trade Center when he heard a noise. Clark tells Global's Mike Armstrong his story and recounts his escape with a man he rescued, whom he remains friends with 25 years later.