A three-year-old boy suffered serious injuries in a hit-and-run crash involving an e-scooter.
The youngster was walking with his grandmother on a pavement in Feltham, west London, when he was hit from behind, the Metropolitan Police said.
He was taken to hospital, where he was found to have suffered two broken collarbones. He has since been discharged.
The rider fell from the scooter on impact, but re-mounted and rode away without stopping.
Police are appealing for witnesses to the incident, which occurred in High Street near the junction with Manor Lane at 6pm on Saturday April 17.
It emerged last month that e-scooters have been used in hundreds of offences, including assaults, burglaries and anti-social behaviour.
Private e-scooters can only legally be used in the UK on private land, but are becoming a common sight on roads and pavements in many urban areas.
Charity Guide Dogs has called for the sale of e-scooters to be banned, describing their use as “a serious safety issue for many people with sight loss” and urging “robust enforcement measures to prohibit their use on pavements”.
Trials of hire schemes have been permitted in cities across Britain since July last year, but no scheme is operating in London, where the hit-and-run occurred.
Anyone who has information about the identity of the rider, or who has dashcam footage of the crash, is asked to call the Collision Investigation Unit on 020 7230 7660 or 101.
They can also send a tweet to the @MetCC account quoting TX/010000398/21, or contact Crimestoppers anonymously by visiting crimestoppers_uk.org or calling 0800 555 111.