Police are warning Vancouver residents not to be alarmed as the University of British Columbia holds a drill designed to test the response to an emerging threat on Tuesday.
Officials say gunfire may echo from several buildings on the campus and victims may be carried out as fully uniformed emergency response teams rush in.
Sgt. Peter Thiessen said even social media users should be aware of the exercise because tweets or posts could be made by mock witnesses or victims of the emergency, giving police a chance to test their reaction to such information.
Thiessen said any mock tweet will carry an alert identifying it as part of an exercise, and he says pedestrians around UBC's Agronomy and Main Mall roads should not be anxious if they see emergency response teams, or what appear to be victims in triage areas outside certain buildings.
The drill involved as many as 200 responders from agencies including the RCMP and Vancouver Police Department.
UBC spokesperson Lucie McNeill said the exercise allows the university to fine-tune its response to emergencies and how it works with the RCMP and other partners.