Dramatic footage caught by eyewitnesses shows the scale of the fire and subsequent damage to the historic Aberfan chapel.
Fire crews responded to the incident at just before 2 this morning and have been re-inspecting the scene throughout the day.
Structural engineers have also visited the chapel, with Jennie Griffiths of South Wales Fire Service tweeting the structure was "in danger of collapse"
The chapel was used as a mortuary by the Aberfan community after the coal tip disaster of 1966, where mud and debris flooded Pantglas Junior School killing 116 children and 28 adults.
Sorry, this content isn't available on your device.
Structural engineers will attend an historic chapel in Aberfan later after a fire broke out early this morning, causing significant damage.
Five fire engines dealt with the flames after being alerted at around 2 this morning, but they have since left.
4 properties surrounding the chapel were also evacuated, but there are no reports of any injuries.
Aberfan Road has been closed by police in both directions until further notice.
Update Aberfan: Crews from Merthyr Treharris Abercynon Aberbargoed Pontypridd and Barry attended 2 jets 1aerial ladder used
A man and a woman have been charged with a number of serious sexual offences, and appeared before magistrates in Caerphilly today.
A 55-year-old man from the Lansbury Park area of Caerphilly, and a 44-year-old woman from the New Tredegar area, were arrested by officers investigating allegations of historical physical and sexual abuse, alleged to have occurred in the Caerphilly and Aberfan areas.
They have been remanded in custody, and are due to appear at Newport Crown Court on August 1.
Gwent Police is asking anyone with concerns about the investigation to ring 101.
The Queen made her fourth trip to the village of Aberfan, before greeting crowds in Ebbw Vale and at Glanusk Park.Read the full story ›
A campaign is underway in Aberfan to save a playground built on the site of the school destroyed in the 1966 disaster.Read the full story ›
Pam Maybank and Frances Minett, who both remember the Aberfan disaster which decimated the village, say they fear for the future of the memorial playground. It was opened by the Queen in the 1970s. She will return on her Jubilee tour next month, but will see some of the equipment has been removed.
People living in the village of Aberfan, where 116 children were killed in a colliery disaster in 1966, say they're fighting for that memory to be upheld. They say that a memorial playground has been allowed to fall into disrepair, and equipment has been removed for health and safety reasons.
Following an independent inspection of the equipment in this playground, the item referred to was deemed to be dangerous and could result in injury. Consequently, in the interest of health and safety, the item had to be removed. The budget for replacement playground equipment was removed twelve years ago under a Labour Council and replacements have been funded through Biffa resources allocated to individual wards. Given the importance of play the Independent Administration has instructed officers to bring forward a report for consideration by Council.