Police are investigating the circumstances surrounding the death of two Devon teenagers in Plymouth.
Police were informed by ambulance at around 1.40am on Saturday 9 December of two men unconscious at Pryzm nightclub in Plymouth.
Two 19-year-old men, one from Okehampton and one from Newton Abbot were taken to Derriford Hospital where they both later died.
Next of kin have been informed, but formal ID for the pair has yet to have taken place.
An 18-year-old man is currently in police custody and awaits questioning in relation to this matter.
Detective Inspector Julie Scoles, said: “It is currently believed that the two men who died were part of a larger group who had taken what they thought to have been MDMA.
“Many of the group were from Okehampton and had visited Plymouth to attend the Basshunter set at the Pryzm nightclub last night.
“We are investigating these deaths and have located the rest of the group who are thankfully showing no ill-effects at this time.
“We are not currently seeking anyone else in connection to this death, but would like to hear from anyone who has any information that can help us with our enquiries.
“I am urging the public, especially those going out and planning to take recreational drugs, to be aware of this incident and think twice before taking any unknown substance; There is always a risk when taking drugs and the only way of staying safe is to avoid drugs altogether.”
For advice on drugs and the possible risks posed, head to www.TalkToFrank.com.
Anyone with any information can contact the police on 101 or firstname.lastname@example.org quoting log number 67 for 9 December.
Information can also be passed anonymously to independent charity Crimestoppers by calling 0800 555 111 or reporting online at www.crimestoppers-uk.org.