Services at one of London's busiest Tube stations were affected during the morning rush-hour after plaster fell from a ceiling.
London Underground said trains on the westbound Central Line were not stopping at Oxford Circus after a "small amount" of plaster fell above a platform.
Chief operating officer Howard Collins said: "This was caused by water ingress and has now been repaired, and trains are stopping normally again. No passengers were hurt or involved in the incident."
Bob Crow, leader of the Rail Maritime and Transport union, said: "RMT has warned repeatedly about the impact of maintenance cuts and specifically the widening of schedules from a 14-day to a 28-day cycle."