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An off-duty police officer was killed when his motorbike crashed into a vehicle in a lay-by on the A41.

PC Kevin Flint, a Thames Valley Police officer based in Chesham, Buckinghamshire, died on his way home from work on Tuesday, the force said.

Hertfordshire Police said his motorbike left the westbound carriageway between Tring and Berkhamsted in Hertfordshire, just before 16:00 GMT.

It then hit the vehicle stopped in the lay-by.

Ch Supt Steve Williams, from Thames Valley Police, said he was confirming the death "with great sadness".

"PC Flint's next of kin have been informed and our thoughts are with them, as well as his friends and colleagues at this extremely difficult time," he said.

The Bedfordshire, Cambridgeshire and Hertfordshire Road Policing Unit are investigating the circumstances that led to the crash.

On Boxing Day, Thames Valley PC Daniel Clayton-Drabble, who was based at Milton Keynes, was killed in a single vehicle car crash at Whittlebury, Northamptonshire.