The Highways Agency said it decided to keep the Boston Manor Viaduct closed because during works it found a crack in a "sensitive location", which requires it to be kept closed until it is repaired.
Diversion on the A312 and the A4. Drivers are being advised to allow extra time for their journeys.
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A British jihadi who has lost two of his brothers in Syria has told ITV News that he intends to stay and fight until he is also killed.
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Another unseasonably warm day, with low cloud and mist clearing to leave long sunny spells.