A 15-year-old boy riding a hoverboard has been killed after colliding with a bus.
Police are appealing for witnesses to the incident in Alperton, west London, shortly before 6.30pm on Thursday.
The boy, who was found seriously injured, was pronounced dead at the scene by paramedics.
Scotland Yard confirmed the boy had been on a hoverboard at the time of the collision in Glacier Way, near the junction of Ealing Road.
It is not known if he was on the pavement or in the road at the time.
Brent councillor James Denselow tweeted: "Sad to hear about the death of a 15-year-old boy in Alperton last night who collided with a bus while riding a hoverboard."
Next of kin have been informed, but he is yet to be formally identified and a post-mortem examination will take place.
The self-balancing scooters have grown in popularity but they are controversial.
The Metropolitan Police has warned a 180-year-old law means they can only be used on private land.
Although they are powered vehicles, hoverboards are regarded as unsafe on British roads, and cannot be licensed or registered under the Highway Act 1835.
But in England, Wales and Scotland, it is also an offence to take it for a spin on the pavement.
Guidance from the Department for Transport says: "You can only ride an unregistered self-balancing scooter on land which is private property, and with the landowner's permission."