Police say a violent absconder from a mental health unit, who was last seen in Walthamstow, was originally sent to the facility after he attempted to murder a PCSO.
Detectives have renewed an appeal to trace Cornell Destouche, who disappeared on April 10 while on escorted leave from a unit in Hackney.
He was in a mini cab at the junction of The Drive and Churchill Road, Walthamstow, when he fled from the vehicle.
Destouche was convicted of attempted murder at Snaresbrook Crown Court in July 2014, for stabbing a Police Community Support Officer. He was detained under a mental health order.
The 25-year-old suffers from paranoid schizophrenia and requires daily medication to control this condition. He has not had this since he absconded.
Detective Inspector Paul Ridley, from Hackney CID, said: "A major investigation is underway to locate Cornell Destouche.
“I must re-iterate my earlier warning to the public - Destouche is a violent individual who could pose a threat if confronted.
“If you see him please do not approach or challenge him, but dial 999 immediately."
Destouche is described as black, of medium build, 5ft 11inches tall, with braided hair and a black beard.
He was last seen wearing a black and grey t-shirt, blue jacket, blue jeans and navy trainers and was carrying a grey rucksack.
DI Ridley added: "If you have information and wish to remain anonymous you can call Crimestoppers - you do not have to supply your details.
"All I require is an indication as to this man's whereabouts and I can assure you it will be immediately acted upon. My primary focus is apprehending Destouche."
Crimestoppers can be contacted on 0800 555 111.