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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Kim Wall, whose body had been cut apart, is believed to have died while on a privately built submarine belonging to a Danish inventor.
Parts of Scotland and northern England will start the day with outbreaks of thundery rain before it slowly clears through the day.