A teenager found dead near a reservoir in Sheffield may have been killed with two large scythes, police have said.
Detectives investigating the alleged murder of 17-year-old Terry Hurst said they were found near the spot where his body was discovered on Tuesday.
He had suffered multiple injuries, including stab wounds, slash wounds, fractures and bruising.
Mr Hurst, from Penistone, was last seen in Bolsterstone on Monday at 1700 BST. He was with a group going camping.
South Yorkshire Police believe he was heading to a camping spot near Broomhead Reservoir, just off New Road.
A South Yorkshire Police spokeswoman added: "We are appealing for help from local people, particularly farmers, to trace the origins of the implements."
Police say it is too early to say if there was any motive for the murder or whether the incident happened at the spot where the body was found.
Inquiries were continuing today at the murder scene.
Two 17-year-old boys and a 15-year-old girl, arrested on Thursday, are still being questioned at separate police stations in the city.