UK police arrested two suspects after a mass stabbing on a London-bound train late Saturday that left 10 people in hospital, nine likely with "life-threatening injuries".

A man charged over a mass stabbing on a busy train in Cambridgeshire and a separate attack at a London station earlier that day has been remanded in custody.

The two suspects are a 32-year-old black British national and a 35-year-old British national of Caribbean descent, police said.