Emergency services are responding to reports of incidents at three London underground stations today, and witnesses reported seeing smoke.

Scotland Yard said they were responding to incidents at Warren Street, Oval and Shepherd's Bush stations on the underground. British Transport police said all of the stations were being evacuated.

A passenger on a tube train about to arrive at Warren Street tube stations said there were reports of an exploding rucksack, the smell of smoke and dozens of panicking passengers running through the train.

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"The train was not far short of Warren Street station when suddenly the doors between my carriage and the next one burst open and dozens of passengers started running through," a retired special constable, called Ivan, told Sky News.