london ambulance service
Two other people were hospitalised.
Pictures posted on social media showed the blaze visible for miles.
No arrests have yet been made.
One force received a record-breaking number of 999 calls in 24 hours.
The station was closed during rush hour.
Police were called to reports of men armed with baseball bats.
This is the capital's third 'noxious substance' attack in a week.
The victim is believed to be a woman in her 20s.
Video shows bonfire exploding in a fireball.
Violence in Mile End, Newham and Ealing.