There are concerns ambulance response times are putting patients lives at risk.
A new report, commissioned by the HSE and Dublin City Council, says two overlapping services in Dublin mean emergency services are missing targets when responding to urgent calls.
Dublin Fire Brigade and the National Ambulance Service share responsibility for 999 calls in Dublin.
Both services failed to respond on time for between 27 and 44 per cent of calls that were life threatening but didn't involve cardiac or respiratory emergencies.
The report says because of this failure, arrangements shouldn't continue the way they are.
The Irish Times obtained the details of the report. Dublin City Council strongly opposed its release.
The report was commissioned in 2016.
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