A 31-year-old e-bike rider is in a life-threatening condition after a collision with a car, police have said.
Emergency services were called to Newmarket Road in Cambridge at 12:10 GMT, and road closures remained in place until about 10:30.
The bike passenger, a 34-year-old woman, was also taken to Addenbrooke’s Hospital with serious injuries and was said to be in a stable condition.
Officers said the driver of the car failed to stop at the scene and three people were later arrested on suspicion of perverting the course of justice.