Detectives are appealing for witnesses following an assault in Enfield.
Police were called at approximately 11:30hrs on Thursday, 10 May to reports of a man assaulted on Fore Street at the junction with Nutfield Close.
Officers attended, and a 39-year-old man was taken by the London Ambulance Service to an east London hospital with a head injury. He remains in a critical condition.
Detectives from Enfield CID would like to speak with anyone who saw the assault, or the moments leading up to it.
Anyone with information is asked to contact officers via 101 quoting reference 2860/10May or Crimestoppers anonymously on 0800 555 111.
A 20-year-old man has been arrested in connection with the investigation and remains in custody at an east London police station.