The chair of the all-party parliamentary group for runaway and missing children and adults, Ann Coffey, explained the group's inquiry found scores of children go missing from care each year and the authorities don't know where they are.
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A "public-spirited" passerby retrieved the child.
A man wanted in connection with a hit-and-run crash which killed a four-year-old girl has been arrested, police have confirmed.
Scotland's First Minister was pictured with her feet up on the sofa while penning the document to Theresa May.