Vandals planted 17 razor blades in a children's sandpit at Southwick.
An Adur Watch Inspector noticed something glinting in the pit at Southwick recreation ground and discovered the blades hidden beneath the sand.
Adur Watch manager Clive Bramble said: "I hate to think what could have happened. The last thing we want to do is to have to close the site at the start of the holidays."
The children's play area is now safe after Friday's discovery.
Adur Watch will carry out increased patrols and the public was asked to be vigilant.
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