Tube staff have gone on strike across the entire London Underground network in a row over ticket office closures.

Workers from the RMT and the Transport Salaried Staffs' Association (TSSA) unions are staging a 24-hour walk out.

"Last-ditch" talks, called for by the Mayor of London, failed to materialise after unions rejected a "new offer" from Transport for London (TfL).

Passengers have been warned that most Zone 1 stations are likely to be closed during the action.

A few have shut since the strike began at 18:00.

It warned there would be "severely reduced service across the Tube network" and no service at all on the Victoria or Waterloo & City lines.

About 150 extra buses were set to be deployed and river services "enhanced" throughout the strike, with "travel ambassadors" deployed to help commuters, TfL said.

more Tube strike: 24-hour London Underground walkout begins - BBC News