The RMT union said it will strike again this Sunday unless a deal is reached with London Underground in a dispute over new rotas.
It also warned of another ballot over “blatant breaches of safety” during the weekend strike – claims denied by London Underground.
Most of the stations that closed were outside the central area, and other stations further out and above ground were left unstaffed with their ticket barriers open.
RMT general secretary Bob Crow accused London Underground of keeping stations open with insufficient staff to cope with an emergency, and using manager and office staff without proper training.
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He said Tube drivers and signal workers may be balloted for action short of strikes over the alleged safety lapses.
Both sides said they hope to reach an agreement before the next scheduled strike.
