Gardai in Cork have questioned a man after an 18-year-old was left fighting for his life following a house party in Cork city on Monday night.

The teenager is in a critical but stable condition at Cork University Hospital after taking 2C-B - a psychoactive substance - at the party on Monday night.

Gardai arrested and questioned a 29-year-old man in connection with the supply of the drug.

He was released without charge earlier and a file is now being prepared for the DPP.

It is understood seven party-goers ingested the substance.

The Health Service Executive (HSE) addiction services issued a warning about possible contaminated 'party pills' - and advise people to not consume unknown substances.

A passer-by who went to the assistance of the people at the party has described the shocking scene he discovered.