South Yorkshire Police are to hold a press conference at 4pm after a missing 14-year-old Lorna Vickerage was found at Euston train station in London.
John Bush, 35, has been arrested on suspicion of child abduction.
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Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.