An investigation by ITV's Daybreak has looked at what a child would do if they were approached by a stranger.
The show recruited volunteer parents, whose children did not know they were being filmed, and a close protection officer, who played the part of a stranger.
Nine children were approached in a park by the 'stranger' and as Daybreak's Daisy McAndrew reports, a worryingly high number of them left with the man.
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Several of victims had life-threatening injuries, police said.