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Commuters face long delays due to a Tube strike over ticket office closures that has reduced Underground services in London.
Members of the Rail, Maritime and Transport (RMT) union mounted picket lines outside stations after walking out at 9pm on Monday.
The action is planned to last for 48 hours and commuters face the prospect of more disruption and long queues on Wednesday morning.
London Underground (LU) said it was running half of Tube services and said two-thirds of stations were open despite the industrial action, but the union said its strike had been "solidly" supported.
Business groups warned the strikes will cost the capital's economy millions of pounds, Sky News reports..