The suspensions follows an incident during their arrest of an individual suspected of robbery last week.
The officers had been called to a suspected robbery at a pharmacy in the Normanville district of Trois-Rivières early Friday morning.
The four officers then chased a suspect to an area near the Trois-Rivières CÉGEP.
It was what happened during the arrest that has brought the officers' conduct into question.
Trois-Rivières city spokesman, Yvan Toutant, would not confirm what the police are suspected of doing.
He said police officials received information about the arrest which is not consistent with the police report.
According to Toutant, the officers have been suspended in the interest of transparency.
Quebec provincial police have been called to investigate.
Sureté du Quebec Sgt. Gregory Gomez del Pradowould only say the force's internal affairs division will be investigating an alleged assault.