Police in Shropshire have cordoned off an area of woodland at Sweeney mountain near Oswestry as the investigate the discovery of bones in the area.
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A woman has been detained on suspicion of conspiracy to commit kidnap and robbery.
The family of Alfie Dingley, 6, have been refused permission to legally use the drug to help control his seizures.
The note was left for paramedics attending an emergency call in Stoke-on-Trent on Sunday morning.