Three staff members have been assaulted after inmates began rioting at the Malmsbury Youth Detention Centre in Victoria.
Emergency services remain at the facility after a group of youths began causing trouble about 2.45pm, police said.
Three staff members were assaulted, and two were treated by paramedics.
One male staff member, aged in his 30s, has been taken to Bendigo Hospital in a serious but stable condition.
Police said damage has been done to the centre.
Investigations are ongoing.
The riot is the latest in a string of violent incidents at Malmsbury this year.
In January, a group of six inmates escaped the facility and stole three cars before being arrested by police.
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