One of the vice principals at Cavelier-De LaSalle High School in Montreal overheard two students speaking between classes shortly after the incident, school board representative Jean-Michel Nahas said.

CNN: STORY HIGHLIGHTS

He serves as Chairman of the Princess Grace Foundation USA, a director of OpSail Foundation, a member of the Board of Overseers of the School of Engineering at the University of Pennsylvania, and is a trustee of LaSalle College High School.

CENTERFORSECURITYPOLICY: Save the Date: Freedom Flame Award in New York, June 14