Razor blades, box cutters and other sharp objects have been found in the Lennox Park sandbox, county authorities said.
Employees at the county park at 10828 Mansel Ave. found the objects near the slides, swings and monkey bars, said Sgt. Gia Neil of the county Sheriff's Department's Lennox Station.
The first discovery was made about three weeks ago.
No injuries have been reported, but authorities are urging caution and are trying to alert families to the potential hazards.