A teenager has been arrested on suspicion of possession of a bladed article after being stopped and searched at a Dagenham underground station.
Felikss Stolarovs, from Leyton, was named as the man fatally struck by a train at Barkingside Tube station in September.
A coroner has opened an investigation after 95-year-old Chingford woman Joyce Greenhill choked to death at her Valley Side home.