London's underground network will be hit by another strike next week, as the RMT union announced a 24-hour walk-out on July 8.

Rail workers on First Great Western will also strike from 6.30pm on July 8 in a row over jobs and other issues, the RMT union has said. The walk-out will last 48 hours.

The tube strike is in connection to the upcoming launch of the tube running all night from September.

Unions and management met for talks which will resume tomorrow. A strike by members of the four unions would cripple Tube services, causing travel chaos across the capital.

The unions are in dispute over pay and conditions for the new all-night Tube, which is due to start at weekends from mid-September.

The RMT said its members voted by 91 per cent in favour of strikes and 96 per cent for other forms of industrial action. The union is also in dispute over a series of other issues including jobs and safety.

RMT general secretary Mick Cash said: “Balloting has concluded today in a series of disputes on London Underground, including the linked issues of pay and night running and also in the long running dispute over station staffing, mass job cuts and ticket office closures.”

In pictures: Tube strike April 2014 Show all 5 1 /5 In pictures: Tube strike April 2014 In pictures: Tube strike April 2014 Tube Strike Commuters travel on the Northern Line of the London Underground which is running a limited service due to industrial action on April 29, 2014 in London, England. Getty Images In pictures: Tube strike April 2014 Tube Strike Commuters at Stratford Underground, Overground and DLR Station in east London, on the first day of a 48 hour strike by tube workers on the London Underground over ticket office closures. PA In pictures: Tube strike April 2014 Tube Strike Commuters prepare to travel on the District Line of the London Underground during strike action on 30 April, 2014 Getty Images In pictures: Tube strike April 2014 Tube Strike Commuters attempting to board a full underground train on day two of a 48 hour underground train strike on 30 April, 2014 Getty Images In pictures: Tube strike April 2014 Tube Strike Commuters wait at Victoria tube station for limited service trains in London, Britain, 29 April 2014. EPA

”The industrial relations situation on the Tube has sunk to an almost unprecedented low with all four unions united and balloting for action over pay and working arrangements due to be ushered in under the guise of the mayor's “night Tube” vanity project in just 10 weeks' time.

Cash said that the changes would lock workers into a “culture of anti-social hours and appalling that would rip apart work/life balance whilst at the same time they are being hit with pay proposals that would undermine their standard of living.“

Steve Griffiths, LU's chief operating officer, said: ”Londoners and businesses overwhelmingly back the night Tube. It will make life easier for everyone, cut journey times, create jobs and boost the economy.