A spokesman for the organizers said Coulter was advised against appearing after about 2,000 "threatening" students crowded the entrance to Marion Hall, posing a security threat.
"It would be physically dangerous for Ann Coulter to proceed with this event," said conservative political activist Ezra Levant inside the hall. "This is an embarrassing day for the University of Ottawa and their student body . . . who chose to silence her through threats and intimidation."