A schizophrenic who tried to kill two women by pushing them off a Tube platform has returned to hospital after going missing for two days.
Christopher Studders has been diagnosed a paranoid schizophrenic
Police said Christopher Studders, 40, voluntarily returned to Chase Farm Hospital, north London, on Wednesday.
He was convicted this year of attempted murder after pushing the women on to a rail line at Euston in May 2003 and detained under the Mental Health Act.
Despite police concerns hospital bosses have denied risking public safety.
Studders returned to the hospital on Wednesday afternoon after walking out while exercising in hospital grounds unsupervised.
A spokesman for Barnet, Enfield and Haringey Mental Health Trust said public safety was a
"paramount" concern in the decision to allow Studders unescorted "ground leave".
"Following a thorough risk assessment, all patients have an individually
tailored treatment plan.
"Over a period of time this is likely to include leave from the ward to support a patient's recovery and is integral to their rehabilitation."
The Trust confirmed an internal investigation was continuing and procedures at the hospital may be reviewed in light of the patient absconding.
A team of 30 officers had been scouring CCTV footage from the London Underground.
His victims - Christine Goldsmith and Tamlyn Monson - told of the attacks from behind screens at the Old Bailey in April.
Miss Goldsmith told the court that, as she climbed from the tracks back on to the platform, she heard Studders admit to another passenger he was trying to kill her.
The court was told Studders should not have been allowed out on that day from St Luke's Hospital, in north London, where he had gone as a voluntary patient a month before.
Dr Katherine Bartlett told the court that Studders had a persecution complex and had been threatening to kill people.
The court also heard Studders had suffered from paranoid schizophrenia since 1995 and had been in hospital on many occasions.