Union announces more London Tube strikes

London's Underground staff are to hold two further 24-hour strikes later this month, threatening more chaos for commuters already hit by strikers protesting plans for night services.

The Rail, Maritime and Transport union said on Tuesday that its members will walk out from 9pm on August 25 and again on the 27th.

Millions of Londoners were forced to walk, cycle or take packed buses to and from work last Thursday as Underground staff staged their second strike in a month over plans to run trains all night at weekends.

Four trade unions are locked in a months-long dispute with management over London Mayor Boris Johnson's plans to run a 24-hour Tube service on Fridays and Saturdays from September 12.

The Tube handles four million journeys every day, meaning many trains and buses become packed during the strikes.

RMT general secretary Mick Cash said: "Staff are angry that their grievances are being ignored and dismissed by both the Mayor and his officials and that there has been no substantial move as of today from London Underground to make progress towards a negotiated settlement."