A woman is dead after a fireball crash between a car and a National Express coach returning from Gatwick Airport - just days before Christmas.
Another woman is fighting for her life after the tragedy, which happened at around 4.30am, while two more people suffered minor injuries.
The woman who died, aged 26, was in the back seat of the Zipcar rental vehicle, while the driver was seriously injured.
Footage from the scene shows large flames engulf the vehicles after the collision in Queenstown Road in south west London.
In one video, a man's voice can be heard saying: "The heat! Can you feel the heat?"
In another, a witness says it "keeps exploding".
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One person, who was in the car, was rushed to a trauma unit as a priority.
Another of the people hurt was travelling on the coach, which was travelling between Gatwick Airport and London Victoria station.
The car involved was a Zip car - a car hire scheme allowing members to pick up vehicles from all over London.
Pictures from the scene show the car and coach after the head-on collision as firefighters battle the flames.
A Met Police statement said: "Officers, London Ambulance Service and London Fire Brigade attended the scene.
"One occupant of the car was pronounced dead at the scene.
"Another occupant of the car is being treated at the scene."
Road closures have been put in place as police investigate the cause of the crash.
A National Express spokeswoman said: "One of our vehicles on the A3 service from Gatwick to London Victoria was involved in an incident with a car on Queenstown Road in the early hours this morning.
"One passenger was taken to hospital and all other passengers were safely transferred to a replacement vehicle for onward travel.
"Emergency services attended the scene and we will continue to provide every assistance with the ongoing investigation.
"Our thoughts are with the family and friends of the occupant of the car, who sadly passed away."
A London Ambulance Service spokesperson said: "We were called at 4.32am this morning to a road traffic collision involving a coach and a car on Chelsea Bridge.
"We sent three ambulance crews, an advanced paramedic, a team leader, an incident response officer and our Hazardous Area Response Team.
"We also dispatched an advance trauma team from London's Air Ambulance which consists of a paramedic and a doctor in a car.
"Despite the best efforts of our medics, one patient sadly died at the scene.
"We took a second patient to a major trauma centre as a priority.
"We treated two further patients for minor injuries: we took one of them to hospital and the other was discharged at the scene."
Transport for London tweeted shortly after the crash: "Queenstown Road is blocked in both directions between Queens Circus and Chelsea Bridge due to a collision and subsequent vehicle fire."
