Three teenagers are due to go on trial for the murder of PC Andrew Harper.
The 28-year-old Thames Valley Police officer died from multiple injuries after responding to a reported burglary near Sulhamstead, West Berkshire, while on duty on August 15 last year.
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Henry Long, 18, of College Piece, Mortimer in Reading, and two 17-year-old boys are charged with murder, manslaughter and conspiracy to steal a quad bike.
Long has denied murder but admitted manslaughter and conspiracy to steal a quad bike.
One of the 17-year-olds has denied all the charges while the third has, to date, entered not guilty pleas to manslaughter and conspiracy to steal.
The case before Mr Justice Edis is due to start today, and expected to go on for up to six weeks.
Click here for live coverage of the trial as it happens.
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