Prisoners at Bowden Institution were expected to remain locked down in their cells until Wednesday after an inmate was stabbed Monday night.
Innisfail RCMP say at about 9:30 p.m., a 27-year-old male inmate at the prison was confronted and attacked by four or five other inmates.
After he was stabbed with a weapon and fell to the ground, he was kicked, punched and stabbed several times.
After the attackers fled the scene, the victim managed to walk to a security point in the prison to seek medical assistance.
He was transported to a local hospital with non-life threatening injuries and was admitted for treatment.
Rick Mollan, assistant warden operations at the federal prison, said the inmate has returned to the prison.
Police have not released any names and are continuing their investigation.
Bowden is a minimum and medium-security prison, currently housing 638 inmates.