Police are urging witnesses to come forward after a woman was left with "substantial injuries" in a hit-and-run.
The 22-year-old pedestrian was hit in Thornham Grove, Stratford, at around 3.40am on Saturday.
She was taken to hospital with injuries which police say are not being treated as life threatening.
Detectives say a vehicle was found nearby and a 22-year-old man was arrested on suspicion of affray and attempted murder.
He remains in police custody.
Inquiries are ongoing to establish whether this vehicle was involved in the collision.
Anyone with information should call police on 101 or Crimestoppers anonymously on 0800 555111.