Two pilots and a critical-care paramedic remained in hospital Saturday after their helicopter responding to an emergency in northern Ontario crashed near Temagami, Ont.

A spokeswoman for Ornge, which co-ordinates the air ambulance system in Ontario, says the injuries are non-life-threatening.

A second paramedic involved in the crash was released.

The four-man crew was on its way late Friday to meet a land ambulance involved in transporting a badly injured snowmobiler, who had smashed into a dock on the middle of Rib Lake.

Provincial police said they had used a sled to remove the snowmobiler from the lake and rushed the victim, who had serious head injuries, to Temiskaming Hospital in New Liskeard.

The helicopter crash occurred as the chopper operated by Canadian Helicopters Ltd. approached a helipad.

The cause of the accident is unknown and the Transportation Safety Board of Canada was called in to investigate.

"Our thoughts are with the family members," Ornge spokeswoman Christine Bujold said from Toronto.

"In terms of cause, I can't speculate."

The agency said the medical transport of patients was not compromised as a result of the incident.

The condition of the injured snowmobiler was not immediately known.

No names have been released.