MOSCOW, Aug 14 (Reuters) - A homemade bomb caused a Russian express train to derail, a railways spokeswoman said on Tuesday.

"The cause of the accident, as ascertained by the competent organs, was a rupture of the railway tracks by an improvised explosive device," a spokeswoman for Russian Railways told Reuters.

The train heading from Moscow to St Petersburg was derailed late on Monday, overturning carriages and wounding dozens of passengers.

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