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7 June 2012, 11:53 | Updated: 7 June 2012, 19:02
Thames Water has confirmed the flood that has closed part of the Central Line for nearly 26 hours was caused by engineers checking for faults in a waterpipe ahead of the Olympics.
The one-hundred year old pipe burst on Wednesday afternoon as soon as the earth around it moved.
It has caused long delays for commuters using the Central Line.
The line re-opened between Leytonstone and Bethnal Green on Thursday afternoon.
The company has told us they are in the process of checking all pipes around Olympic venues, but have admitted that they don't know how many more pipes maybe at risk.