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Two people have been arrested by police investigating the suspected drug-related death of an 18-year-old man at a party.
The suspects, a 20-year-old man and an 18-year-old woman, were held on suspicion of manslaughter and supplying controlled drugs.
The arrests followed the sudden death of a teenager who is thought to have inhaled an unknown substance at a gathering on Chobham Common, Surrey, on Saturday night.
A post-mortem examination on the victim, who has not been formally identified, was being carried out today, Surrey Police said.
The teenager, who was from the Farnham area, is suspected to have taken a substance possibly through an inhaler before he died.
His death prompted an urgent warning to others who were at the party and may have taken a substance sold as 2C-I or 2C-E to seek medical help if they feel unwell.
Temporary Superintendent Matt Goodridge said: "Our advice is to go to A&E immediately if you believe you took this drug and start to exhibit worrying symptoms.
"Similarly, if you think you have taken this drug elsewhere and start to feel unwell, our advice is to seek urgent medical attention.''
He added: "We have carried out extensive inquiries following the tragic death of this young man and the fact that we have already made two arrests demonstrates our commitment to tackling the use and supply of illegal drugs.''
Police said they were informed of the death of the man by the South East Coast Ambulance Service at around 10.15am yesterday.
The 20-year-old man was arrested in Gloucestershire and is in custody there. The woman was detained in Bristol where she is being held.
Police said a number of searches were being carried out in connection with the investigation as they called for the public's help in stopping the drug from spreading.
Mr Goodridge appealed for anyone with information about the substance or who was at the event on Saturday night to call Surrey Police on 101 or Crimestoppers anonymously on 0800 555 111.