Two are admitted to a nearby hospital and 50 members of the Canadian Air Force are searching for the other two.
Two crew members are missing after a CH-147 Chinook helicopter CH of the Canadian Air Force crashed in the Ottawa River.
The Air Force is looking for them.
According to the Air Force, the incident happened at around 12:10 a.m. local time near the Canadian Army base in eastern Ontario.
The Canadian Air Force said the Chinook helicopter was operating near the Ottawa River in Garrison Petawawa.
The accident occurred during a training flight.
Four crew members were on board the helicopter.
Two are admitted to a nearby hospital and 50 members of the Canadian Air Force are searching for the other two.
The Marine Unit of the Ontario Provincial Police is also assisting in this.
Prime Minister Justin Trudeau has wished for the speedy recovery of the members of the Air Force who were injured in this incident and has expressed hope that the two other members will be found soon.