POLICE believe there could be a link between an Anglesey youngster's death and an illegal drug named Green Apples.
Phil Jones, aged 19, of Llangefni, died on Saturday after he was rushed from Holyhead to Ysbyty Gwynedd after suspected drug use.
Meanwhile, a 19 year old Bangor man has receovered after taking controlled drugs.
DCI Adrian Williams of Caernarfon CID said: "At this time we are not treating the deaths as suspicious but they are ‘unexplained’ and therefore an investigation will take place to ascertain the exact cause of death.
"From our initial enquiries there appears to be a link in that we understand both young men took the drug Green Apples, which information suggests is a form of MDMA (Ecstasy), albeit work is on-going to confirm this."
Toxicology tests and a post-mortem examination are due to be carried out.
DCI Williams expresssed his sympathies for Mr Jones' family, and added: “We continue to work with our partners to highlight the dangers of drug abuse and a pro-active team actively targets people involved in the illegal supply of drugs.
" I should stress that while we have no credible information to suggest there is a ‘rogue batch’ of illegal drugs in circulation, people are requested to take the appropriate precautions.
“The police rely heavily on information from the community regarding drug dealing and information provided will be dealt with confidentially.”
An inquest into Mr Jones' death has been opened and adjourned.
Anyone with information about those who use or supply Green Apples, or any other controlled drug, should contact North Wales Police on 101 or call Crimestoppers anonymously on 0800 555 111.