HMP Liverpool officers have walked out over health and safety concerns.
Staff at the Walton prison staged the protest in the wake of a colleague being dismissed following an investigation into using reasonable force on an inmate.
It has been claimed that the officer acted in self-defence amid ongoing fears over a rising level of violence from prisoners at the facility in recent months and years.
Mark Fairhurst, national chair of the Prison Officer Association, confirmed that Thursday’s walk-out will continue until prison bosses choose to act on the situation.
“This situation today can be easily resolved,” he told the Liverpool Echo.
“Staff have a right to protect themselves and they need assurances that they will be supported when they try to protect themselves.”