A woman in her 30s is fighting for her life after she was found injured on the ground moments after riding her e-bike, which police said had gone when they arrived.
The woman was found by police on Corporation Road in Leicester at around 3pm last Sunday.
The woman was taken to hospital, where she remains in a critical condition.
Police said the victim was riding an e-bike in the moments before she was injured, but it had disappeared when police arrived.
Two 18-year-old men were arrested this week in connection with the incident.
One was arrested on suspicion of robbery, causing grievous bodily harm and theft of a motor vehicle.
The second was arrested on suspicion of causing grievous bodily harm and robbery. They were both released on police bail while enquiries are continuing.
The theft offence relates to a moped believed to have been stolen from the New Parks area on Wednesday, May 28.
Detective Sergeant Adrian Davies for the forces Complex Crime Unit, said: ‘We have spoken to lots of witnesses in our enquiries this week, but we know there are more people out there who may have seen what’s happened – it was a very busy Sunday afternoon in a busy area of the city.
‘Any tiny piece of information, no matter how small, may prove crucial to our investigation.
‘There is a critically ill woman, still in hospital following this incident and we have to find out what has happened to her.’
Anyone with information is urged to contact Leicestershire Police.