Officers in Doncaster have stepped up patrols at a local activity centre after a number of thefts from vehicles.
Police have carried out covert and overt checks following a spate of periodic attacks of vehicles parked at Bawtry Paintball, while their owners were out having fun.
They are also working closely with the business owner and staff to improve security.
Sergeant Russ Higham, of South Yorkshire Police said: “We noticed spikes in the numbers of vehicles getting broken into at Bawtry Paintball’s car park.
“Thieves have smashed windows and stolen mobile phones, money, purses, wallets and sat navs – basically anything left on view.
“We’d urge vehicle owners not to leave valuables on show and to ensure their vehicle is locked before they go paintballing.”
Both police and the business have put up security cameras at the centre, which is based off Bawtry Road.
Owner Carl Broadbent said: “We are working with police to look at these crimes and put measures in place. We’ve installed lockers for members of the public to use, put signage up and are including safety messages in briefings and on the website.
“We want everyone to make sure their valuables are safe and to remain vigilant.”