The riot involved prisoners in the Douglas Hall section on the ground floor of the jail, who kicked off their campaign at around 8pm. Police, fire engines and ambulance crews were called to the prison, near Livingston. The incident is now being investigated by police and a "small number" of inmates were put into the segregation unit following the riot.
Reports that the prisoners were rioting because they had not been fed for two days have been denied by the Scottish Prison Service. A spokesman said: "I heard the claims about them not being fed and it's just not true." No-one was injured during the incident, and the emergency services were called in as a precaution. No prisoners were arrested, however five people will be reported to the Procurator Fiscal.
Last month, 12 members of staff were sacked from the prison in West Lothian after bosses reportedly discovered they had criminal records.