An investigation is underway in Dublin following the deaths of six people, possibly as a result of contaminated heroin.
Four heroin addicts were pronounced dead at the Mater hospital, one at Beaumont and another at St Vincent's hospital.
Post mortems have been carried out but gardaí are still awaiting toxicology reports.
One of the victims is a 36-year-old man who collapsed at his home on Railway Street in Dublin.
Gardaí believe there may be a consignment of contaminated heroin being sold on the streets of Dublin and have appealed for any addicts who are feeling unwell to present themselves for treatment.
The National Disease Surveillance Centre had warned addicts to seek medical attention if they developed symptoms such as blurred vision, speech paralysis and breathing problems.
