Police in Southwark are appealing for information and witnesses after a man was found with serious head injuries at the southern approach to the Rotherhithe Tunnel.

Officers were flagged down at 4.19am on Friday 26 June after a man was found collapsed.

They attended to the man who was unresponsive and suffering from a serious head injury.

London Ambulance Service arrived soon after and took the man, believed to be 19 years old, to a central London hospital. His condition is critical.

Officers believe they know the identity of the injured man and his next-of-kin have been informed.

No arrests have been made.

Anyone with information regarding this incident is urged to call police on 101 or Crimestoppers anonymously on 0800-555-111.