A manhunt is underway as police try to find a convicted patient who has escaped from a psychiatric unit in Southall.
Ahmed Mohammed, 25, was sentenced in 2002 to a hospital order for indecent assault against lone females.
He had been a resident at a secure mental health facility at West London Mental Health Trust, Uxbridge Road, Southall.
Staff discovered he was missing at about 2.50pm on Saturday.
He is considered a danger to women and should not be approached.
He is described as a black Somalian man, 6ft tall, short haired, clean shaven and with a proportionate build.
He was last seen wearing a blue shirt, navy 'McKenzie' jacket, grey jogging bottoms and black Nike trainers.
He is known to have connections in the Wandsworth and Tooting areas of London.
Anyone who knows his whereabouts, or who may have seen him should call 999 immediately.
A spokesman for West London Mental Health Trust said: "We can confirm that a patient absconded from our premises on Saturday, September 27, running away from his escort while on escorted ground leave.
"We immediately put in place all abscond procedures, including informing the Metropolitan Police and the Ministry of Justice.
"As with any such incident, the trust is investigating the circumstances of the patient's absconsion."