The Abertawe Bro Morgannwg University Health Board said this afternoon it is reviewing "all aspects" regarding Sonia Powell's death in an ambulance outside Swansea's Morriston Hospital.
The Health Board is reviewing all aspects of what happened and we are currently discussing these with the family.
We can confirm the ambulance with two paramedics on board left Neath Port Talbot Hospital at 2.49pm and arrived at Morriston Hospital at 3.04pm.
The Emergency Department doctor began his assessment of the patient in the ambulance at 3.07pm. A doctor remained with Mrs Powell on the ambulance until she sadly passed away at 3.40pm."
"Yesterday was a busy day for Emergency Departments and this was intensified at Morriston by 20 emergency ambulances arriving and departing within a short space of time," she continued.
The family of a woman who died in a queue of ambulances outside hospital are demanding action so that this doesn't happen again.Read the full story ›
By Rupert Evelyn: Wales and West of England Correspondent
It was a "nightmare" say the family of a woman who died waiting in an ambulance outside A&E at the Morriston Hospital in Swansea.
Sonia Powell's daughters have told ITV News that people with "cuts and bruises" were being admitted while their mother, who was critically ill, was kept outside.
When eventually she was seen by a doctor it transpired he had travelled to the Morriston from Neath Port Talbot Hospital, the same location that Sonia Powell had just been sent from.
Her family are furious about the way she was treated and claim that paramedics who transferred her could not explain why she had been moved.
ABMU, the board that run both hospitals, are due to release a statement responding to the family's claims shortly.
Heartbroken relatives of a grandmother who died while waiting in a queue of ambulances outside a hospital have demanded an apology from health bosses.
Sonia Powell, was taken to Morriston Hospital's Accident & Emergency Unit in Swansea, south Wales, on Wednesday afternoon, following a suspected heart attack.
The family of Sonia Powell said the 73-year-old had been waiting "at least an hour" by the time she died.
Health officials, who say the wait was in fact around 40 minutes, have now launched an investigation.
More than 2,600 people have now died from Ebola, the World Health Organisation said.
The organisation reported more than 5,000 cases across west Africa, describing the crisis as "unparalleled in modern times".
Shadow Health Minister, Darren Millar, has called for a "Keogh-style" inquiry into the Welsh NHS.
He said: "The evidence is stacking up, demonstrating that all is not well in the Welsh health service and an independent inquiry could help identify problems and put them right, before it's too late.
Experienced medical experts are saying that without an inquiry, some NHS services are facing imminent meltdown - a disturbing warning that Labour ministers must heed.
Do-gooders who defensively act as cheerleaders for their local health board and reject any sort of review are putting Welsh patients at risk.
We love the NHS and want to help staff deliver the best possible service for patients, but that is only possible if we have the courage to hold a thorough inquiry to identify any problems and put them right.
A woman has died in an ambulance whilst waiting in a queue outside Morriston hospital.
The patient, who hasn't been named, died this afternoon at approximately 3.40pm after being transferred from another hospital.
In a joint statement Abertawe Bro Morgannwg Health Board and the Welsh Ambulance Service said a review is being launched into what happened.
The Emergency Department at Morriston Hospital has been very busy with a high number of ambulances arriving in a short space of time. Escalation plans have been activated and staff across the hospital are working closely with colleagues from WAST to keep delays to a minimum.
At approximately 3.05pm this afternoon, Thursday 17 September, a patient arrived via ambulance at Swansea’s Morriston Hospital from another hospital.
The patient was assessed immediately upon arrival and remained in the care of a doctor and the ambulance crew whilst waiting to be admitted into hospital.
Sadly, at approximately 3.40pm the patient passed away. We wish to express our sincere condolences to the patient’s family.
We will be urgently reviewing the circumstances to ensure we have a proper and full understanding of what happened. It is too early at this stage to comment any further.?
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The World Health Organisation and UNICEF have said they are providing a team of experts to help investigate how 15 children died following a vaccination programme in northern Syria.
A joint statement said that they supported the suspension of the programme "for as long as the facts remain unclear" but that it was vital to start it again as soon as possible.