Police are trying to trace a terror suspect in breach of a special order restricting his movements.
Mohammed Ahmed Mohamed slipped under the radar of counter-terrorism officers after he disguised himself in a burka when leaving a mosque in West London on Friday afternoon.
He's not been seen since.
Somalia-born Mohamed, who is 5ft 8in tall and of medium build, arrived at the An-Noor Masjid and Community Centre in Church Road, Acton, at 10am on Friday.
He was last seen there at 3.15pm that day.
The 27-year-old is not considered a "direct" threat to the public but the police are urging the public not to approach him but dial 999.
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"All it takes is for somebody to see me - and I could just die, just like that. I could want to go to the shop and not come home."
Before the killing, Peters searched the internet for "serial killers", "treatment of child killers in prison" and "premeditated murder".
Arriva Rail North, Greater Anglia and South Western Railway are all affected.