There was a disturbance at the Niagara Detention Centre but it didn't last long.
It started around 3:30 p.m. yesterday and involved about five inmates.
The Ministry of Corrections says it was resolved about an hour and a half later without any injuries or significant property damage.
Niagara Regional Police along with firefighters from St. Catharines and Thorold fire responded to a call of a possible fire at the jail.
When fire crews arrived, they were not permitted to enter the facility. They staged in the parking lot of the nearby John Michael’s Banquet and Conference Hall to wait for the green light to enter the jail.
Firefighters cleared the area around 5:00 p.m.
An investigation into the cause of the incident is still ongoing