A bad batch of the heroin substitute physeptone could be linked to the deaths of two young men, gardai said tonight.
Gardai said the men - both known to be drug addicts - died in Arklow, Co, Wicklow today.
This morning a 20-year-old was found dead in a house in the town, while a 23-year-old died in hospital in the early hours of this morning.
Gardai said they were investigating the possibility that poisonous heroin or physeptone could be in circulation in the area.
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Deputy State Pathologist Marie Cassidy was due to carry out post-mortem examinations on the bodies of the men.