Ten people have been arrested on suspicion of murdering a police officer killed while attending a reported burglary.
PC Andrew Harper, of Thames Valley Police, died at about 23:30 BST on Thursday in Berkshire.
The force said the 10 males arrested were aged between 13 and 30, and remain in custody.
Prime Minister Boris Johnson told the BBC the officer’s death was a “mindless and brutal crime”.
Police said PC Harper, who was from the Roads Policing Unit based in Abingdon, was “killed while performing his duties”, but have not confirmed any further details.
Source: BBC News