Emergency services are at the scene after the crash on the B4518 at the Llyn Clywedog reservoir near Llanidloes, Powys.
There are fears that four people have died after a car plunged into a reservoir in mid Wales.
Emergency services are at the scene after the crash on the B4518 at the Llyn Clywedog reservoir near Llanidloes, Powys.
It is understood one female has been found alive but four other people were in the vehicle. The car is said to be in up to 40m (100ft) of water.
There are reports of a collision involving two cars beforehand.
An RAF helicopter joined firefighters and ambulance crews at the reservoir.
The incident happened on the B4518 near Staylittle. The road has been closed at its junctions with the B4569 and the A470.
The care went into the water at the Llyn Clywedog reservoir, near Bwlch-y-Gle Dam One eyewitness said the car appeared to have gone into the water about five to 10 yards from the road, before it took a sharp left up a hill towards the picnic area.
One woman working in a car showroom nearby said she was told that one car clipped another, and one of them went into the war.
“We saw lots of police cars going past, ambulances and two recovery boats,” said the woman, who did not want to be named.
“They have closed the road, it’s a B-road, it’s not somewhere where spectators can go.”
Mid and West Wales Fire and Rescue Service said two fire crews and two boats were involved in the operation.
Firefighters received a call from Dyfed-Powys Police shortly after 1430 BST.
Two fire engines, one from Llanidloes and one from Newtown, and rescue boats from Aberystwyth and Llanidloes headed to the scene.
RAF Valley, based in Anglesey, sent a Sea King helicopter search and rescue crew.
Severn Trent Water, which operates part of the reservoir, said two vehicles were involved in the incident, one of which finished up in the secondary dam.
Dyfed-Powys Police said a serious road traffic collision had occurred at Bwlch-y-Gle Dam near Llanidloes.
It read: “Police received a call regarding the incident where a vehicle entered the reservoir. The area is currently being searched.”
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