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The Boston tragedy will not put off spectators or runners taking part in tomorrow's London Marathon, the race's chief executive has insisted.

Security has been stepped up for the event, with a 40% increase in the number of police officers following the bombing of the Boston marathon.

The race's chief executive Nick Bitel said the enhanced police presence would help ensure the event will be "as safe and fun as it always is".

Scotland Yard said several hundred more officers will be out on the streets on Sunday, an increase of two-fifths on last year.

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