People are being urged to be vigilant after glass was smashed and scattered across equipment at a Raunds play area.
Raunds Town Council says the anti-social behaviour took place twice last week at the Saddlers play area off Weybridge Way.
A council spokesman said: “On Monday (July 25) glass was shattered throughout the play area and also on the play equipment.
"The same incident happened again on Wednesday (July 27).
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"One of our operations officers has endeavoured to pick up all the glass but we cannot guarantee that all the tiny fragments have been located.
"Please be mindful when using the play area.”
A police spokesman said “Glass bottles are believed to have been broken deliberately into small pieces and scattered throughout the play area and on play equipment at the Saddlers play area in Raunds.
"This has caused a potential hazard to those using the play equipment and those who had to clear it up.”