An urgent manhunt has been launched for a man believed to be a "significant risk" to the public.
Mahad Abdulkadir Mahamud, 26, escaped from Chase Farm Hospital in Enfield on Monday at around 5.30pm.
Mahamud had been detained under the Mental Health Act and is considered a risk to the public as he has previously randomly attacked strangers.
Mahamud is 6ft 1ins, medium build, with balding black hair and a beard.
He was last seen wearing grey jogging bottoms.
The public are advised not to approach Mahamud.
DCI Paul Ridley said: “Mahamud has previously seriously assaulted another person completely unknown to him and is considered a serious risk to the public.
"Extensive efforts are being made by my investigation team to locate this man, but we are also asking for the public's help. If you see this man, please do not to approach or challenge him, but dial 999 immediately."
Mahamud has connections with Camden and Hertfordshire areas.
Anyone with information on his whereabouts should contact police on 999 quoting CAD 5851/13JUN.
To remain anonymous contact the independent charity Crimestoppers on 0800 555 111.