Police in Lambeth are appealing for information and witnesses after a man was found critically injured.
Officers were called by London Ambulance Service (LAS) at 20:25hrs on Tuesday, 17 January following reports of a man fallen.
LAS and police attended and found a man in his twenties suffering from injuries after falling from Waterloo Bridge onto the Thames side walkway.
The man has been taken to a central London hospital where he remains in a critical condition.
Next of kin have been informed.
No arrests have been made. Enquiries are ongong,
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.