Park wardens have been ordered to stop and interrogate anyone who is not accompanied by children.
The visitors who are quizzed have to explain their presence and risk being thrown out or reported to police if their answers are not satisfactory.
The policy has been introduced at Telford Town Park in Shropshire. The council which manages the 420-acre area says it is a 'commonsense approach' aimed at safeguarding children.
But park users accused it of 'authoritarian madness' and said the ruling risked panicking parents about the dangers faced from potential paedophiles.
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