A man who went missing from a mental health unit in Homerton in East London has been arrested.
Anthony Knowles had been on escorted leave when he disappeared on Saturday.
Police had warned the public not to approach the 48-year-old. Scotland Yard said that he was detained at an address in Hackney.
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The eagle-eyed resident spotted the mistake on signs just feet apart in south London.
The victim was attacked after bumping into a man at the ticket barrier at Putney Station.
The victim, who is his 40s, was found near the edge of palace grounds.