Police are attempting to track down witnesses who filmed a violent robbery before uploading clips of the incident onto social media.
Bystanders were seen filming a 45-year-old vulnerable woman as she was stamped on her arm and head by a thief who had demanded money from her.
The man left her lying seriously injured on the pavement on Ramilles Close, near Brixton Hill, London, having stolen no more than £20.
The victim was taken to a south London hospital where she received emergency treatment for multiple injuries including a fractured skull and an arm broken in several places.
Police say she is still recovering from her injuries.
Detectives want to speak to a number of people who witnessed the attack, including those who filmed it.
Detective Constable Nicky Dixon, from Lambeth CID, said: “This was a brutal attack of a vulnerable woman in broad daylight. She was unable to defend herself and was left semi-conscious on the ground with serious injuries which required emergency treatment.
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“We know the assault was witnessed by people who have not come forward and I would urge them to speak with us.
“This is man is a danger to the public and needs to be caught – someone knows who he is and I appeal to you directly for your help.”
The suspect is described as a light-skinned black man. He was wearing a dark hooded top, a shiny bottle green gilet and dark coloured tracksuit trousers.
Anyone with information is asked to contact officers on 07785 774447 or via @MetCC. Alternatively, call Crimestoppers anonymously on 0800 555 111.