Staff at the downtown Toronto facility hear the declaration of a "code orange" and whir into action - they know it's a simulation designed to test the hospital's response to catastrophe but their reaction is real.

After the Danforth shooting, many of the wounded were taken to St. Michael's Hospital for life-saving surgery. It's one of two adult trauma centres in Toronto. Farah Nasser speaks with Dr. Najma Ahmed, who operated on most of the victims that night.

Local hospital employees represented by CUPE will be gathering at the corner of Queen Street East and Bond Street at 4 p.m. on Tuesday.