World Champion and Olympic gold medallist Mo Farah will face fellow distance-running greats Kenenisa Bekele and Haile Gebreselassie at the Bupa Great North Run in Newcastle today.
Farah will fire the starting pistol for the shorter 5km event, organisers said.
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There will be patchy light rain across the UK, but sunny spells in the west.
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The 650-feet long hole emerged after a water main burst near the 14th-century Ponte Vecchio bridge.