Police are appealing for information after three men threw paint stripper on prison officers' cars at HMP Manchester.
The crime occurred at the staff car park on Southall Street on 11 October at around 9pm.
Three hooded men smashed windows and threw paint stripper on the cars, causing extensive damage, before they were interrupted by the police.
The men then fled over a nearby railings and chased from the scene.
Detective Inspector Kirsty Simcox of Greater Manchester Police’s Challenger Manchester team, said:
This was a cruel and incredibly damaging attack, where the offenders clearly targeted the owners of the cars for their role.
Anyone with information should contact police on 0161 856 3735 or 101, quoting incident number 2085 of 11/10/17. This can also be done anonymously through the independent charity Crimestoppers on 0800 555 111.