Talks aimed at averting a 24-hour strike by London Underground workers from Sunday evening have collapsed and the walkout will go ahead, causing travel chaos in the capital.

Members of the Transport Salaried Staffs Association (TSSA) and the Rail, Maritime and Transport (RMT) union will strike from 6pm on Sunday in a long-running dispute over job losses and ticket office closures.

The unions met LU bosses for several sessions this week under the chairmanship of the conciliation service Acas but said no progress had been made.

RMT general secretary Mick Cash said: "Despite huge efforts by the union negotiating team, London Underground have failed to come up with any serious plans to tackle the staffing and safety crisis caused by the axing of nearly 900 safety-critical station jobs.

"Instead of resolving the issues, Tube bosses have chosen instead to ramp up the rhetoric with threats to mobilise a strike-breaking army of 'ambassadors' with severe consequences for the current safety regime across the Tube network.

"As a result of the management failure to face up to the current crisis, the talks have collapsed and all industrial actions remains on.

"It is up to London Underground to take full responsibility for this situation and to come back to us with a serious set of proposals."

Transport for London warned there will be a "severely reduced" service across the network on Sunday evening and all day on Monday.

Passengers were advised to complete their journeys by 6pm on Sunday, and that most Zone 1 stations are likely to be closed throughout the action.

There will be no services on the Victoria or Waterloo & City lines, or from busy stations such as Waterloo, King's Cross, Euston, London Bridge, Paddington or Victoria.

TfL has said it was committed to addressing recommendations in a recent report by London Travelwatch into the closure of ticket offices and has started working with the unions to review the staffing model and put more station staff roles back where needed.

An Acas spokesman said: "Talks have adjourned and our services remain available."

TSSA general secretary, Manuel Cortes, said: "We are extremely disappointed not to have a solution to the dispute but we await the outcome of London Underground's latest position.

"We will study it carefully but sadly fear it will be unlikely to meet the aspirations of our members. Our strike will still go ahead as scheduled on Sunday evening, but our negotiating team will remain available throughout the weekend to resume talks."

Steve Griffiths, Chief Operating Officer for London Underground, said: "There is no need to strike. We had always intended to review staffing levels and have had constructive discussions with the unions. We agree that we need more staff in our stations and have already started to recruit 150 extra staff.

"This number is bound to increase as we work through the other areas that need to be addressed. Taking into account existing vacancies and natural turnover this means that around 500 staff will be recruited for stations this year. There will also be increased opportunities for promotion.

"All of this will ensure that our customers feel safe, fully supported and able to access the right assistance in our stations at all times. We encourage the unions to continue working with us on this process and we are available for talks at all times through the weekend in order to resolve this dispute."

The Mayor of London, Sadiq Khan, said: "This strike is unnecessary and I urge the unions to call it off immediately.

"A lot of progress has been made and there is a good deal on the table. I strongly urge the unions to call off this strike which will cause misery and disruption to millions of Londoners.

"I have instructed TfL to work around the clock throughout the weekend to continue negotiating to resolve this dispute. There is no reason for the unions to strike.

"I can assure Londoners that we will continue to do everything we can to avert this strike."