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Bilodeau said police were searching for a green helicopter with red and white markings that landed at the prison, though she didn’t know whether it landed in a prison yard, on a building or nearby. She said it was last seen heading west from Quebec City.
She said a lone pilot was believed to have been aboard the copter when it arrived at the prison.
“There is a massive manhunt going on to try to locate them,” she said.
Airports were alerted to watch for the aircraft, and the military was helping in an air search, she said.
She said she was uncertain of the crimes the men had committed but said they had been sent to prison as a result of Project Crayfish.
That investigation of drug trafficking led to the arrest of dozens of people on various charges.
In March 2013, two men escaped from a prison northwest of Montreal by climbing into a hovering helicopter that had been hijacked. The escapees and two people accused of hijacking the copter were captured within hours, according to media reports at the time.