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PC Andrew Harper was dragged for a mile behind their car, after he tried to stop the group towing away a quad bike, stolen from outside a house in west Berkshire.
The driver, Henry Long, 19, and his passengers Albert Bowers and Jessie Cole, both 18, had denied murder. Long earlier admitted manslaughter and his co-accused were found guilty of the same offence by a jury at the Old Bailey in central London.
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