Two people were taken to hospital after a crash near Hatton Cross station.
Police were called to Hatton Road last Friday (July 11) at about 12.15pm after a collision between a black Audi and a grey Suzuki.
A police spokesman said the London Ambulance Service and London Fire Brigade also attended the scene and two people were taken to hospital, though neither was believed to have been seriously injured.
He added that the road had to be closed because liquid, believed to be petrol, had leaked onto the tarmac, and the incident caused a considerable amount of traffic.
Nobody was arrested in connection with the incident.