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A woman was sexually assaulted on a train but none of the other passengers intervened because they thought the victim and her attacker were a couple, police say.
According to British Transport Police, a man followed the woman onto a train at London Bridge station at 12.53am on Friday 18 July.
He sat next to her and touched her inappropriately. This continued for around 20 minutes before he departed at Chislehurst in south east London.