Two boys, one aged 23 months and the other 10, have died in a car crash.
The collision happened on the Birmingham New Road in Wolverhampton, at the junction with Lawnswood Avenue, at about 8.45pm on Thursday, West Midlands Police said.
The children were in a BMW car with their mother, who was seriously injured and remains in hospital.
The driver of an Audi S3 which struck the BMW left the scene, while a 31-year-old man driving a third car, a Bentley, was arrested on suspicion of causing death by dangerous driving, said the force.
Medics treated the badly injured youngsters, but nothing could be done to save them and they were pronounced dead at the scene, West Midlands Ambulance Service said.
Accident investigators were at the incident overnight, where a blue Audi A3 could be seen with a crumpled front end as well as a white BMW which had also been extensively damaged.
The BMW’s offside airbags had deployed and the car had come to a stop, having gone through roadside metal pedestrian barriers.
A witness who saw the aftermath said it had been a “massive” accident and he heard “a woman screaming”.
The man, who lives locally and declined to be named, said: “It’s very sad to hear that children have been killed.”