British Transport Police
Anti-hate crime charity says increase is "quite clearly" linked to Covid-19 and points to Donald Trump's "Chinese virus" comments.
The ticket officer died in April after being assaulted while working at Victoria Station.
Exclusive: British Transport Police confirmed they only heard about incident at Victoria station in May.
Belly Mujinga, 47, was at Victoria station when she was spat at and coughed on.
It is the first high-profile law enforcement operation since Boris Johnson announced strict new curbs on Brits' lives.
British Transport Police say a murder investigation has been launched.
Death a result of a fight between two groups of men.
Climate change activists have attempted to disrupt trains at Canning Town, Stratford and Shadwell.
The dead man and woman were known to each other, police have confirmed.
Two men aged 19 and 21 have been remanded in police custody.