Police investigating a deadly house fire in rural Powys which killed six members of the same family have said it could take months to find out the cause.

The blaze broke out at a farmhouse in Llangammarch Wells in the early hours of last Monday morning.

Dyfed-Powys Police said five children aged between four and 11 and one man, named as David Cuthbertson died in the fire, which is still being treated as 'unexplained.'

Three children aged between 10 and 13 escaped the fire and were released from hospital and are being cared for by family.

The nature of this fire was so intense, the scene presents significant difficulties in respect of the recovery of any remains, and assessments of the scene, and this will take some considerable time. The investigation is ongoing and we continue to treat the cause of the fire as unexplained.

Detective Chief Inspector, Martin Slevin, Senior Investigating Officer, Dyfed-Powys

In the coming days and weeks experts are facing the task of carefully taking down the outer walls of the house - 260 tonnes of bricks and mortar - by hand. Once complete, we will section-off the inside of the house and begin the delicate search for those inside. There will be specialist scientists at the scene to look at what we find.

Tony Brown, South Wales Police Chief Supt