One person has died and 15 others have been hurt in a crash between two buses and a car in south-east London.
The crash occurred on Sevenoaks Road in Orpington at about 22:10 GMT on Thursday.
London Ambulance Service said one person was pronounced dead at the scene and 15 people had been taken to hospital. Three have serious injuries.
A man who was driving the car has been arrested on suspicion of causing death by dangerous driving, the Met said.
The London Fire Brigade (LFB) sent 60 firefighters to the scene of the collision.
Fire crews rescued several people from the single-decker buses, helped carry out first aid and made the vehicles safe, according to LFB Assistant Commissioner Graham Ellis.
Road closures have been put in place and police have advised motorists to use alternative routes.
Six bus routes have also been diverted.
A woman riding an electric scooter has been killed in a crash with a lorry in south-west London.
The 35-year-old was pronounced dead at the scene at the Queen Circus roundabout, Battersea following the crash at about 08:30 BST.
A Metropolitan Police spokeswoman said her next of kin had yet to be informed and no arrests had been made.
In July last year a cyclist was killed at the roundabout after being hit by a bin lorry.
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.”
Transport for London and Wandsworth Council redesigned the roundabout in 2015, which trialled the use of raised kerbs and separate traffic lights to keep cyclists and vehicles segregated at junctions.
Concerns had been raised that the new layout was too complicated.
While the cause of the crash is unknown, e-scooters are illegal to ride on public roads, including in cycle lanes or on the pavement.
A Department for Transport 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.”
An electric scooter, or e-scooter, is similar to a traditional children’s scooter but has a motorised engine attached.