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Police have made several arrests in connection with the murder of a newly married police officer in Berkshire.
PC Andrew Harper was killed on 15 August after being dragged along by a car near the village of Sulhamstead.
Thames Valley Police officers have re-arrested three teenagers on Tuesday on suspicion of theft and murder.
Two 17-year-old boys and an 18-year-old man, all from the Reading area, were originally arrested on 16 August and released on bail until 12 September, before having their bail extended to 16 November.
On Tuesday, a 21-year-old man from the Basingstoke area was also arrested in connection with the investigation for the first time.
All four suspects remain in police custody.
Detective Superintendent Ailsa Kent, of the Thames Valley Major Crime Unit, said the arrests followed "new evidence coming to light as the investigation has progressed in recent weeks".
Several arrest warrants were carried out by more than 100 officers across Berkshire and Hampshire on Tuesday morning.
DS Kent added: "Members of the public might see an increased police presence at the locations of these warrants today. We appreciate the public's patience and support while we progress these critical lines of inquiry.
"This is an ongoing, complex investigation, and we remain committed to achieving justice for PC Harper, his family, friends and colleagues."
PC Harper's wife Lissie described her husband as "the kindest, loveliest, most selfless person" after his death.
She added: "My darling boy, I do not know how I will be able to survive without you.
"You had the best sense of humour and never took life too seriously. You treasured every moment and always had a smile on your face."
The couple had been married for just four weeks and were about to go on their honeymoon.
Another man - Jed Foster, a 20-year-old from Reading - was charged over PC Harper's death on 19 August but has denied murder. He was remanded in custody.
Anyone with information is asked to call Thames Valley Police on 101, of they can contact Crimestoppers anonymously 0800 555 111.