Someone inside the Le Patriote pool hall opened fire, seriously wounding one man, at 3:45 a.m.
He was taken to hospital with two gunshot wounds to his lower body.
A doorman at the bar was also stabbed.
He managed to get himself to hospital despite his injuries.
Local police in St-Eustache responded to the incident.
More than one suspect is still at large.
Provincial police have taken over the investigation.