POLICE are appealing for information after booby traps made from wine bottle corks and nails were found in bushland at Bolton Point.
Officers from Lake Macquarie Police District were called to Alexanders Trail, in Lake Macquarie State Conservation Area, about 12.40pm on Monday when a jogger found the devices hidden in three piles of leaves.
Police said the wine corks with nails protruding from them were similar to historic weapons known as caltrops.
They are urging residents to take extra care.
The jogger alerted police and photographed the spikes to warn others of the hazard.
"It seemed to have been a quite intentional attempt to cause harm," the jogger said.
The jogger speculated that the spikes might have been maliciously set to target trail bikes, mountain bikes, or 4WDs.
Officers from Lake Macquarie Police District have begun an investigation into the circumstances surrounding the devices.
They are urging anyone who may have information or noticed suspicious activity in the area to contact Toronto Police Station on 4088 1099 or, alternatively, call Crime Stoppers on 1800 333 000.