Welsh hospitals have failed to meet the target for patients to be seen in A&E within four hours, figures have revealed.
Data released by the Welsh Government show the percentage of patients spending less than four hours in A&E fell in February and was the lowest since records began.
It also showed the number of patients spending more than 12 hours in A&E decreased slightly from January, but was the second highest on record.
The figures showed a 3.8% increase in the number of patients attending A&E units across Wales at 2,715 per day.
The Royal College of Emergency Medicine said today's figures are "unacceptable" and patients and staff will "continue to suffer" unless hospitals are given more resource.
The Welsh Ambulance Service received 1,369 calls per day, which is the second highest average on record.
Calls to the ambulance service are graded in order of severity - red, amber and green - with a red call considered to be life threatening. The target response time for a red call is eight minutes.
An amber call has no target response time.
February's figures show more than half of all amber calls made to the ambulance service resulted in a wait of 30 minutes or more.
Compared with the previous year, this figure was 24.9%.
The Welsh Health Secretary said the figures confirm it is the "busiest winter on record".
The percentage of people starting cancer treatment within the target time fell in January.
85.3% of patients newly diagnosed with cancer via the 'Urgent Suspected Cancer' route started treatment within the target time of 62 days - below the target of 95%.