A British police officer who was killed while attending a reported burglary in southeast England was "dragged along" by a vehicle, Thames Valley Police Chief Constable John Campbell said on Friday.
Ten males aged between 13 and 30 have been arrested on suspicion of murder. The exact cause of death of Andrew Harper, 28, was still being investigated, police said.
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"We are all shocked and saddened by the death of our colleague PC Andrew Harper, " Chief Const Campbell told journalists on Friday. "It's felt very personally," he added.
British Prime Minister Boris Johnson described it as a "mindless" and "brutal crime" on Friday.
Earlier in August the Prime Minister promised 10,000 extra prison places, 20,000 more police officers and an urgent review of the sentencing of criminals.
The focus on crime and other domestic issues before Britain is due to leave the European Union on October 31 has fuelled speculation that Johnson is planning to call an election.
The opposition Labour Party leader Jeremy Corbyn said the officer's death reflected growth in violent crime in Britain.