Five teenagers held on suspicion of dangerous driving after four people died in a horrific crash between two cars have been released on bail, police said.
Three 17-year-olds and a 68-year-old woman were killed by the collision which took place in Powys, Mid Wales, as a number of vehicles travelled in a convoy.
Five male drivers, aged 17 and 18, from other vehicles, were arrested. A police spokeswoman said they were released on bail pending further inquiries.
"Two other 17-year-old males were arrested overnight. They have also been released on bail. Police are appealing for witnesses to the collision to come forward."
The accident happened on the A470 near Storey Arms, Brecon, between Libanus and RAC bends, just before 10.15pm on Friday.
Two vehicles were involved - a black Volkswagen Golf estate and a green Volkswagen Golf. The black Golf is not believed to be part of the convoy.
Police said a 17-year-old male youth driving the green Golf and another 17-year-old male youth who was a passenger also died, and a 17-year-old female who was among three other passengers taken to hospital in a serious condition has since died.
The driver and front seat passenger in the Golf estate were taken to hospital, and the passenger, 68-year-old Margaret Elizabeth Challis, has since died. The driver's condition is described as serious. The teenagers were named locally as Corey Price, Rhodri Miller and his girlfriend Alesha O'Connor. Rhodri, who was driving, had only recently passed his test while Corey was a promising young footballer who trained with the Cardiff City Football Academy.
Elsewhere, two boys aged 13 and 14 from the Leeds area were killed and two more are fighting for their lives after the car they were travelling in left the road "at speed" and hit a tree.
The boys are thought to have been picked up by a 21-year-old without the permission of their parents. The driver is seriously ill in hospital.
The accident happened at 1.50pm yesterday on the A62 Gelderd Road, Morley, Leeds, West Yorkshire Police said.