One of the young people at 'Time to Shine' was Liam Archer who competes in partially-sighted football. He hopes to represent Britain at the next Paralympics in Rio. Ria Chatterjee spoke to him.
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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.