Police are desperately searching for a man who was spotted falling from Tower Bridge into the River Thames on Friday evening.
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City of London Police said the man was seen on the bridge in London at around 5.50pm.
A CCTV image of the man has been released. He has not yet been identified.
Police received reports from several witnesses that the man, described as black and wearing dark clothing, had fallen into the river.
Officers are continuing to search the area including the river, as well as making local enquiries to identify the man. They are now calling on anyone who was in the area at the time for their help.
Police asked: "Were you on or near Tower Bridge at the time? Do you remember seeing what happened? If so, we want to hear from you.
"If you can help the investigation, please contact the City of London Police immediately by calling 020 7601 2999. Alternatively, information can be provided anonymously to the independent charity Crimestoppers on 0800 555 111.