Eight-inch metal spikes embedded in open ground at a Nottinghamshire village are a danger to the public, the police have said.
The spikes, found at The Warren, a grassed area in Annesley Village, have caused damaged to vehicles and injuries to people and pets.
It is believed they have been used to try and deter illegal off-road bikers.
But officers say the spikes are not only dangerous, but also ineffective at stopping the bikers.
The spikes have injured a young girl out walking and a man walking his dog, which was also hurt.
They have even damaged a police car which was trying to deal with illegal bikers.
Pc Joanna Dickson, local beat manager, said: "They are a danger to members of the public and to vehicles.
"People are being hurt - a problem I don't think whoever did this anticipated."