Police are hunting for a woman filmed during a vile racist rant while on a District Line train.
The foul-mouthed commuter kept repeating: "‘If your country is so good, f*** off back there."
The film does not show what may have provoked the woman into such a rant.
She continues: "You come in this country you f***ing mother f***ers c***. You want everything on a plate f***ing c*** and expect us to take this.
‘You are all racist c***s, you want to take over the world."
Detective Constable Lawrence Murphy said: "We have isolated images of a woman we believe may be able to help us with our investigation into the incident.
"We believe the footage was filmed on an eastbound District line train, which passed through Stepney Green Tube station and Mile End station.
"At this stage, we urge anyone who witnessed this incident, or who recognises the woman, to get in touch and help us build up a full picture of exactly what took place.
"We treat all allegations of racism very seriously and urge anyone with information about this incident to contact us."