Signs are being put up on a beach in Essex warning about the danger of unexploded hand grenades.
Five of the second world war devices have been washed up at Dovercourt near Harwich.
Recently, a device was found on the shoreline at Marine Parade when an off-duty military explosives expert saw a person throwing a grenade around for a dog to chase.
It's prompted the council to seek expert advice on whether it needs to close the area off.
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