A mental health patient has absconded from a mental health unit in Hackney, Scotland Yard said.
Cornell Destouche, 25, requires daily medication to control his paranoid schizophrenia.
Police have warned the public not to approach Mr Destouche, who has a history of violence, and to call 999 immediately if he is spotted.
Mr Destouche was last seen on Sunday at 5pm, after he fled from a minicab during a period of escorted leave.
According to reports, he was being treated at the John Howard Centre in Homerton.
Detective Inspector Paul Ridley, from Hackney CID, said: "Extensive efforts are being made to trace Cornell Destouche.
"He has a history of violence and could pose a threat if confronted. If you see him please do not approach or challenge him but dial 999 immediately."
Mr Destouche was last spotted at a junction between The Drive and Churchill Road, Walthamstow.
He is described as black, 5ft 11in tall (1.8m), of medium build, with braided hair and a black beard.
CCTV footage from the day he disappeared showed him wearing a black and grey T-shirt, blue jacket, blue jeans and navy trainers. He was also carrying a grey rucksack.
He is known to have ties to east London, including Leyton, Barking, Hackney and Newham.
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