This is the moment shocked tourists were caught in the middle of a foul-mouthed row between teenage girls and another London Underground passenger over an empty seat.
The incident, which took place late at night on the Piccadilly Line, was filmed and posted online by American tourist Zainab Hameed.
The fracas seemed innocuous at the start, after one of the teenage girls stopped another passenger from sitting in a spare seat.
But it escalated quickly, with one man having to be restrained by a friend as the carriage was filled with shouting and swearing.
Ms Hameed, 22, from Los Angeles, was stunned at how quickly the dispute turned into a full blown argument.
