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20 May 2011, 19:17 | Updated: 20 May 2011, 19:19
ransport for London has told Heart delays on the Jubilee line yesterday were caused by a screw - which jammed in a platform door, stopping it closing.
East-bound services came to a halt at Westminster for around 15 minutes at the height of rush-hour yesterday morning (May 19).
TfL say it is not the sort of screw they use so it must have been dropped by a passenger.