A murder investigation has been launched after a police officer was killed on Thursday night while attending a reported burglary near the village of Sulhamstead in Berkshire.
Pc Andrew Harper, an officer based in Abingdon, was killed near to the A4, Bath Road, between Reading and Newbury.
Police have arrested 10 men in connection with the incident, including a 13-year-old boy.
The men are being held in “various police stations across the Thames Valley,” police said.
A police cordon remains in place at the scene of the incident, and the A4 has been reopened.
Police have appealed for members of the public to come forward with information.
Deputy Chief Constable Jason Hogg said: “Our deepest thoughts at this time are of course with Andrew’s friends and family, who are being supported by specially trained family liaison officers.
“Our thoughts also extend to all of Andrew’s colleagues within Thames Valley Police.
“As a force we are devastated at the loss of our colleague and will all be supporting each other at this difficult time.”
Senior investigating officer Detective Chief Inspector Stuart Blaik, of the Thames Valley Police Major Crime Unit, said: “This is a tragic incident, and I would like to reassure the public as well as our officers and staff that we have launched a full and thorough investigation to establish what has happened.