A 27-year-old man from Merthyr Tydfil has been arrested in connection with a fire at the historic Aberfan chapel.
Fire crews were called to the building in the early hours of Saturday morning where investigations found that the fire was started deliberately.
The fire was extinguished by South wales Fire and Rescue Services but much of the building was destroyed.
Anyone with any information concerning the incident is urged to contact South Wales Police on 101 or call Crimestoppers anonymously on 0800 555 111.
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.
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.
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.
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.