06/18/2013 08:13 EDT | Updated 08/18/2013 05:12 EDT

Hundreds mourn crew killed in Ornge air ambulance crash

Hundreds gathered in Toronto on Tuesday afternoon to mourn the loss of two pilots and two paramedics killed in an Ornge air ambulance crash last month.

- 4 Ornge helicopter crash victims ID'd as from Ontario, Quebec.

- Burlington paramedic's father mourns his son's death in Ornge crash.

Capt. Don Filliter, First Officer Jacques Dupuy, and fight paramedics Dustin Dagenais and Chris Snowball were killed when an Ornge helicopter crashed following takeoff from Moosonee, Ont.

Premier Kathleen Wynne and Health Minister Deb Matthews were among those who attended Tuesday's memorial service.

The helicopter had just left its base at the Moosonee airport to pick up a patient in the remote Attawapiskat First Nation when it crashed early on May 31.

Ornge took its five remaining Sikorsky S76 helicopters out of service for several days as a precaution.

Transportation Safety Board officers investigating the crash have said mechanical failure did not appear to be the cause.