It is believed a person was injured on the London Underground tracks.
Passengers on Central Line trains have been advised to find alternative routes on Thursday, with Tubes stopped between Liverpool Street and Leytonstone.
Transport for London said in an update: “Central Line: No service between Leytonstone and Liverpool Street whilst the emergency services deal with a casualty on the track.
“SEVERE DELAYS on the rest of the line. London Underground tickets will be accepted on London Buses and Greater Anglia services.”
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