A man is fighting for life today after being attacked in the street.
The 22-year-old is in critical condition in hospital after being found with serious head injuries.
Scotland Yard said officers were alerted at about 10.45 last night to an incident in Downing Road, Dagenham, east London.
The victim, a local man, was found near the junction with Darcy Gardens and taken to a hospital in Essex.
A 22-year-old man was arrested at the scene on suspicion of assault and is in custody at an east London police station.
Detectives appealed for anyone who may have seen an altercation or anything suspicious to come forward.
Anyone who could help was asked to call the incident room at Barking on 020-8345 3775, or if wishing to remain anonymous Crimestoppers on 0800 555 111.