Polish student Ania Jedrkowiak, 21, was found with stab wounds in an alley in South Ealing.
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Video caption: London Underground: Machete attacker guilty of attempted murder Ricky Morgan set upon a complete stranger in an unprovoked attack on a train in central London last summer.
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Video caption: A man has been arrested following four stabbings in a house in south-east London. The victims, three women and a man, were all pronounced dead at the scene by emergency workers.