Five people have been injured after a multi-vehicle crash involving a bus and several cars.
More than 70 homes lost power after the crash affected a power cable in Rhondda Cynon Taff.
Firefighters worked to free people trapped at Trebanog Road in Porth at about 09:00 BST on Wednesday.
Three of those injured were taken to hospital – two to University Hospital of Wales, Cardiff, and one to Royal Glamorgan Hospital in Pontyclun.
The crash involved a bus, a van, a large goods vehicle and several cars.
Three people were freed from the wreckage while a further two managed to get out themselves.
Western Power is also at the scene dealing with the power cuts in the area.
The road is expected to stay shut “for some time” and South Wales Police asked people to avoid the area.