Peter McNaught, London Underground's Operations Director, said: "London Underground has an excellent and continually improving safety record and such incidents on the Tube are very rare."
McNaught added: "We apologised fully to our customers, worked hard to resume services as soon as possible and our staff were on hand on the platform to assist those who were leaving the train. We have fully assisted the RAIB in their enquiries, as well as carrying out our own investigation.
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Omid Saidy, 20, was knifed to death after asking a drug dealer and another man to leave the area, police say.