A 13-year-old has been arrested over an e-bike crash involving a pregnant woman whose baby was born afterwards in hospital and remains in a serious condition.
It happened on 26 January in Herbert Avenue, Poole, and police said the rider reportedly failed to stop at the scene.
The female pedestrian, in her 30s, went to hospital after the collision - which happened around 3.50pm.
Officers said a 13-year-old boy from Poole had now been arrested on suspicion of a driving offence and remained in custody.
Police Sergeant Dan Yates, from Dorset Police, said: "Our investigation is continuing and we have now made an arrest as part of our enquiries.
"I would like to thank the public who came forward and provided information to help with our investigation.
"We are still appealing for anyone with information in relation to this incident, who has not already spoken to police, to please get in touch."
Anyone with information is asked to contact Dorset Police or - to stay anonymous - the Crimestoppers charity.
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