Police said the intended victims were three boys and one girl were students at Ecole Polyvalente Hyacinthe-Delorme, as were the two suspects.
The teenaged suspects, ages 14 and 16, were arrested last Wednesday and were charged the next day with three counts each of conspiracy to commit murder and criminal harassment and one charge each of attempting to administer a date rape drug.
They will remain in police custody until this week’s bail hearing, which will take place on either Monday afternoon or Tuesday.
Sureté du Quebec spokesperson Audrey-Anne Bilodeau one of the suspect’s parents tipped off police.
The boy’s mother allegedly found threatening messages and the plot’s details on one of her son’s social media accounts.
She credited the cooperation of parents and the school for allowing police to act in time.
“A search was held in the school and an investigation was able to demonstrate that the young people were about to execute their plan,” she said, adding that a knife was found in one of the boys’ lockers.
Bilodeau said young people should be aware that threats made on social media are taken seriously by police.
Because of the Youth Criminal Justice Act neither the suspects, nor the alleged victims, can be named.