The Welsh Ambulance Service says it is "very concerned at the handover delays that have been experienced recently".
It is "concerned that pressure across all hospitals in Wales has a direct impact on the ambulance response that is able to be provided to patients who call 999 for our help."
"Ambulance crews continue to provide clinical care for patients as they wait to be admitted into hospital and we provide ambulance clinicians, where possible, to care for patients in emergency departments to support the nursing and medical staff in hospitals."
More top news
The Pride of Britain Awards are less than a month away, and today we find out who'll represent Wales in the Fundraiser of the Year category.
Police are appealing for information following a sexual assault on a 29 year old woman that took place in Pontllanfraith.
The personal tragedies and triumphs that have shaped his life. Terry Yorath: Life on the Edge, ITV Cymru Wales on Monday, 23 October (8pm).