<img src='https://i.cbc.ca/1.3064666.1524701232!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/hospital-hallway.jpg' alt='Hospital Hallway' width='460' title='Disasters with high casualties are a rare occurence in Canada. Still hospitals need to be ready and prepared. At Toronto's Sunnybrook Health Sciences Centre they have mock disaster tests to train emergency staff to respond to such emergencies.' height='259' /> News of mass casualties in the wake of Toronto's van attack on Monday sent Sunnybrook Health Sciences Centre into a "Code Orange," with trauma nurses and doctors mobilizing to treat the bulk of casualties involved.