East London NHS Foundation Trust has launched an immediate internal investigation into the circumstances surrounding the escape of a patient from the John Howard Centre.
We have reviewed our security and processes as a matter of urgency.
The Trust is working with the police to assist them with their investigation.
More top news
The mother of a former altar boy who tried to blow up a train insisted he was 'a big softie' who didn't want to hurt anyone.
Its current five year licence comes to an end next Tuesday.
Extra armed police will guard major sporting events in London this weekend after the military was drafted in to protect key locations.