A passenger alarm caused delays on the Jubilee Line on the morning of Thursday 17 September. At Waterloo and Canada Water there was travel chaos, with reports of significant overcrowding at the stations at the height of the rush hour and passengers prevented from entering as trains were delayed. Others were forced to take alternative routes to reach their destination.

Transport for London (TfL) said that the delays were caused by a passenger alarm at Southwark, and trains were moving again four minutes later. "A passenger alarm was activated at 8.55am. Trains were moving again four minutes later," said a spokesman.

Passengers though reported delays of up to 45 minutes as queues of delayed trains cleared. According to the TfL website, a normal service is now running on the line.