North Yorkshire Police is asking parents to warn their children of the consequences of trying to frighten people following a spate of "clown" incidents across North Yorkshire.
In Scarborough, two boys dressed as clowns jumped out on a younger boy at Seamer Cricket Pitch last night.
A North Yorkshire Police spokesman said: "In the early evening of last night, North Yorkshire Police received at least eight reports from concerned members of the public about young people dressed up as clowns, jumping out at them or chasing after them.
"While some people may think this is funny, it is not for the person on the receiving end.
"It could also constitute a criminal offence if you frighten or threaten other people.
"The same applies regardless of what kind of mask you are wearing, if you set out to frighten or alarm people, you could be committing an offence.
"Of the incidents reported on Monday evening, the majority were believed to be children dressed up."