A teenager has died after taking an illegal drug at a party in Chobham Common on Saturday night.
The 18 year old from Farnham is believed to have taken a substance that was sold as the illegal class A drug 2C-1 or 2C-E.
It is possible that the drug was taken through an inhaler.
Police are urging anyone who took the substance at the party and are displaying worrying symptoms to go A & E urgently.
Chief Inspector Alison Barlow said: "Whilst a post mortem examination still needs to be carried out to establish the cause of this boy's death, we are extremely concerned that it could be linked to him taking this drug".
"The advice to anyone who was at the event on Chobham Common who might have taken this drug and is exhibiting worrying symptoms is to attend A&E immediately".
"Similarly if you believe you may have taken this same substance elsewhere and are feeling unwell then please seek medical assistance".
"We also need the public's help in getting this potentially fatal drug off the streets of Surrey".
Anyone with information about this substance or with any other information which could aid the ongoing investigation is asked to call Surrey Police on 101.
If you have information but do not want to give your name you can pass details to independent charity Crimestoppers anonymously on 0800 555 111."
