Police are appealing for witnesses after a man was discovered critically injured on the Thames Path alongside Waterloo Bridge.
Officers and the London Ambulance Service found the man in his 20s on the ground at about 8.25pm on Tuesday 17 January.
He has been taken to a central London hospital where he remains in a critical condition.
Anyone who witnessed this incident or has information is asked to call the police on 101 or by tweeting @MetCC. You can also call Crimestoppers anonymously on 0800 555 111.