UPDATE 5.27pm

A Welsh Ambulance Service statement said following today’s power outage their ICT systems have gradually been restored throughout the day, although they continue to work on resuming full normal service.

They said: "We are also continuing to work on restoring our non-emergency patient transport service.

"We have been notifying patients who would have been affected by today’s disruption of their planned transport arrangement as well as planning for tomorrow’s (Thursday 2 June) requests.

"For any appointment queries, patients should contact their normal treatment clinic.

"Thank you to everyone for their patience and co-operation during today’s disruption.

"Please remember only to call us in life-threatening emergencies and consider alternatives to 999, like your GP, pharmacist, NHS Direct Wales or Minor Injuries Unit."

UPDATE: 4.18pm

A Welsh Ambulance Service spokeswoman said issues with their IT systems should be resolved imminently.

10.27am

THE Welsh Ambulance Service has asked people to call them "only if it's serious or life-threatening" after their IT systems went down this morning.

The Welsh Ambulance Service has released a statement saying they had "experienced a power loss which has affected our ability to receive 999 calls".

They said they were is using fall back systems which means the service is still running but that they "need the public to use us wisely".

Engineers are working to resolve the problem in order to restore normal service as soon as possible.

Richard Lee, Director of Operations at the Welsh Ambulance Service, said: “Please only ring us if the situation is life-threatening, and use us appropriately.

Thankyou for your patience, please remember to call us only if it's serious or life-threatening. pic.twitter.com/e9QBsDfeIi

— WelshAmbulance (@WelshAmbulance) June 1, 2016

“If you have a life-threatening emergency, you should continue to dial 999. We will answer your call and we will get an ambulance to you.

“If we dispatch an ambulance, and you’re able, it would be helpful if someone is able to wait for the ambulance in the street in order to flag it down.

“If you’re ill and unsure what to do, you can call NHS Direct Wales on 0845 46 47 or visit the website, where you’ll find a wealth of advice and information.

“Don’t forget about your GP, your nearest pharmacist or Minor Injuries Unit, where there is no need for an appointment.”

They ask that people keep checking the Trust’s Twitter and Facebook accounts for news and updates.