A fourth suspect has been taken into custody today following an incident in Poplar on Friday evening where a man was found fatally stabbed in the back.
All four of the suspects were arrested on suspicion of murder. The victim was named earlier as Liam Hamilton.
More top news
"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.