Police are investigating after at least five vehicles had their windows smashed at Tandle Hill Country Park in Royton, Oldham, on Thursday afternoon.
Officers were called at around 4:30pm, but the culprit had already fled the scene. Many of the victims were dog walkers who visit the park regularly, some several times a day.
It is believed one window was broken on each car, leading victims to suspect opportunistic thieves. Greater Manchester Police have urged anyone with information to come forward.
A GMP spokesman said: 'We were called just before 5pm on Thursday to Tandle Hill park to reports that around five cars had had their windows smashed before offenders fled the scene.'
This incident follows a similar occurrence last year when two women had their cars stolen while walking in the park after being confronted by masked thugs armed with knives.
Anyone with information is asked to call GMP on 101, quoting log number 1442 of January 24, or contact Crimestoppers anonymously on 0800 555 111.
