Paintball operators in Australia are being warned to look out for players conducting military-style drills amid concerns they may be training for overseas terror groups.
Newscorp reports police have made a number of visits to Australian paintball centres, asking operators to report any behaviour patterns that go beyond having fun with friends.
Officers recently visited a centre in NSW, after a group who were being covertly monitored by authorities used their credit cards to book a session for a number of men to play the popular recreational activity.
Law enforcement sources have recently confirmed the number of Australian citizens travelling overseas to fight for terror groups has risen to more than 200.
A paintball industry source confirmed to Newscorp that clubs across the country have reported being contacted by authorities in the past.
The Australian Federal Police said it "does not comment on operational or intelligence matters".