A teenager has been arrested in Cork in connection with the death of a 16-year-old boy from a suspected drug overdose yesterday.

Michael Cornacchia's body was discovered at his home in Deermount in the city yesterday morning.

The teenage male was arrested in the city yesterday afternoon.

Gardaí investigating the death have analysed a substance seized following the discovery of the teenager's body and confirmed that it is the psychoactive opioid known as U-4.

It is the first time the synthetic drug has been recorded in this country and doctors are concerned about its availability here.

RTÉ News understands that the teenager who was arrested was questioned for a number of hours by detectives at Cork's Bridewell Garda Station about the supply of the U-4 drug.

The teenager was later released without charge, but a file on his case is to be prepared for the Director of Public Prosecutions.

The HSE has issued a warning to drug users about the U-4 drug and are appealing to people who may have the white powder substance not to take it and to dispose of it safely.

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Dr Chris Luke, a leading consultant in emergency medicine, has said he is concerned that the discovery of the U-4 drug in this country may be the first sign of a potential epidemic of artificial opiates being abused here.

Cork City Councillor Mick Finn, who knows the Cornacchia family, says they have been left devastated.