The Victorian government is expected to pay for the relocation costs of a prison guard at the Metropolitan Remand Centre and his family, after inmates accessed the private addresses and personal information of several staff during a violent riot last month.

A prisoner, who is the subject of an ongoing investigation by Victoria Police, scrawled a threat at the Ravenhall​ facility that referred explicitly to an attack on a guard's family home. The guard's wife is also believed to work in an administrative role at the prison in Melbourne's west.

Last month's riot at Ravenhall, which provoked an armed response, led to the loss of personal information relating to guards and their families. Credit:Pat Scala.

The couple and their children were immediately relocated to short-term accommodation after the riot on June 30, but are unable to return home because of safety concerns.

A source at Ravenhall​ said the threatening graffiti was found in a section of the prison that houses outlaw motorcycle gangs.