A Sussex council is calling on residents to be vigilant after four slides were stolen from children's playgrounds in the space of three days.
The slides, all over 9ft (3m) long, were taken from Lindfield Common, Scaynes Hill and Haywards Heath. The first was stolen on Tuesday.
"It is very unusual - not something we have ever come across before," said a spokesman for Mid Sussex council.
The spokesman said thieves would have needed a large van or lorry.
Councillor Pru Moore said the council feared more slides would be stolen from its 120 playgrounds.
Enjoy the outdoors
"Those responsible should be ashamed of themselves," she said.
"It's so important that young people have the chance to enjoy the outdoors and socialise with other children at local playgrounds and this opportunity is being taken away from our youngsters.
"So far we do not know how or when the slides are being removed, but it could even be that the culprits are posing as workmen and removing the slides in plain sight.
"I urge anyone that lives or works close to a playground to keep an eye out and report anything suspicious."
The thefts have been reported to Sussex Police.