Police are still dealing with the aftermath of a serious crash on a mountain road in the Valleys – and, as of midnight on Friday, the road is expected to remain shut for several hours.

The alarm was raised on Thursday evening – and a large number of emergency vehicles were reported being seen by locals in Treherbert.

The full extent of the crash – and the number of people involved and the extent of their injuries – has not yet been revealed by police.

Sources say it is “unlikely” police will provide further updates on the incident until later on Friday morning.

In the meantime, here is everything we know so far about the incident

• The crash happened on the mountain road between Treherbert and Hirwaun – Rhigos Road on the A4061. Reports say it happened on the section nearer Treherbert.  This hasn’t been confirmed though.

• Emergency services were called at 7.10pm. Police, fire and ambulance were all dispatched.
   
• Incident immediately described as “serious” by police.
   
• The road was closed in both directions after crash. It will stay shut for “some time”, detectives have said.
   
• Eyewitnesses reported a large number of emergency service vehicles at the scene. One said: “I saw about seven ambulances, police, fire – at the last count there was about 15 sirens”.
   
• An ambulance was involved in the crash. No information has been provided on what type of ambulance – such as whether it was a ‘normal’ one or a rapid response vehicle. And no details on the crew or whether they were carrying a patient have been disclosed either.
   
• Police are keeping the road shut so they can carry out “investigative work” at the crash site. Lengthy road closures – involving things such as a through examination of the road  – only happen for the most serious kind of road traffic collisions.
   
• Detectives have since launched a public appealing for information. Anyone with information or was in the area at the time and has dashcam footage is asked to contact South Wales Police via 101 or email publicservicecentre@south-wales.pnn.police.uk quoting reference 2000456336.