Police confirm a 31-year-old woman has died following a series of alleged hit-and-run collisions in Cardiff on Friday afternoon.
Twelve other people have been injured - including at least seven children. Their conditions are currently unknown.
Police have arrested a 31-year-old man, who is being held at Cardiff Bay police station.
The woman has been named locally as Karina Menzies.
There have been at least four incidents across the western side of the city, at locations including Grand Avenue in Ely, Sloper Road, Crossways Road and Cowbridge Road West.
Rob Osborne has been following the investigation so far.
Other reports of the incident suggested the driver deliberately ploughed into parents walking home with young children after school.
"We had a customer in our shop who said the van mounted the curb like the driver wanted to run down young kids with their parents," a female shop worker in Grand Avenue, who did not want to be named, said.
"It was really frightening, people were screaming and shouting out, it was chaotic," she added.
One witness described the aftermath when two people were injured near the retail park in Leckwith.
"I was coming to get some tickets for the football, when I heard a van speeding" said Steven Christopher.
"I thought nothing of it, but then a girl said two women had been run over here".
The Welsh Ambulance Service has confirmed 12 other people have been taken to hospital - some with 'serious injuries'.