A woman has died after being struck by a lorry while riding an electric scooter, police said.
The victim, in her 30s, was pronounced dead at the scene in Battersea, south-west London.
Scooters with electric motors are banned from public roads and pavements in the UK.
The crash happened at Queen’s Circus roundabout shortly after 8.30am on Friday.
A Metropolitan Police spokeswoman said her next of kin are yet to be informed.
No arrests have been made.
A London Ambulance Service spokeswoman said: “We sent an advanced paramedic, two ambulance crews, an incident response officer and two medics in cars to the scene, with the first of our medics arriving in under four minutes.
“Sadly, despite the extensive efforts of medics, a woman died at the scene.”
Several roads were closed while the scene was investigated, including Chelsea Bridge and Nine Elms Lane.
Electric scooters can exceed 30mph and are increasingly being used for short journeys in a number of countries, including in many European cities and the US.
In the UK they can only be legally used on private land, but this policy could be reversed as the Department for Transport is carrying out a review of legislation to accommodate changes in the way people and goods move.
A DfT spokeswoman said: “We extend our deepest sympathies to all those involved in this tragic incident, and fully support the police as they carry out their investigations.
“Safety is at the heart of all our road laws and it is important that retailers continue to remind people at the point of sale that it is illegal to ride e-scooters on public roads.”
Transport for London and Wandsworth Council redesigned Queen’s Circus roundabout in 2015.
This trialled the use of raised kerbs and separate traffic lights to keep cyclists and vehicles segregated at junctions, but concerns were raised that the new layout was too complicated.
A cyclist was killed at the roundabout in July last year after being hit by a bin lorry.