Secretary of State for the Home Department Priti Patel, whose Home Office is responsible for law and order in the country, added: "My thoughts are with the family of PC Andrew Harper who was killed in the line of duty last night".
He wrote on Twitter: "I am deeply shocked and appalled by the death of a fearless officer on duty in Thames Valley last night".
Few other details about his slaying were known Friday - but 10 people between the ages of 13 and 30 were arrested in connection to the murder, according to Chief Constable John Campbell. The Board of Trustees extends their condolences to the family, friends and colleagues of PC Harper at this incredibly hard time. "We come together as a brotherhood at times like this and hopefully your family can take some comfort from that love and support".
Grieving colleagues laid floral tributes at the scene of Harper's death, with one describing him as "Thames Valley's finest".
He died after an incident near the A4 between Reading and Newbury at around 11:30PM.
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.
All our thoughts - and the thoughts of the entire police family across the United Kingdom - are with the family, friends and close colleagues of PC Harper who died last night.
"Our thoughts also extend to all of Andrew's colleagues within Thames Valley Police".
"Just a really awful day", his grandmother Maureen Shrimpton said on Facebook.
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The force said PC Harper, who became a regular officer in 2011 after joining as a special constable a year earlier, had attended the reported break-in with a fellow officer.
The Island's chief constable has branded the death of a police officer in the United Kingdom "appalling".
Pictures show PC Harper and his new wife Lissie celebrating their wedding at the award-winning stately venue Ardington House, a Georgian manor in Oxfordshire set in gardens and parkland.
He said the force's flags are flying at half mast as a sign of respect "in honour and memory of Andrew".
The scene is now being examined by detectives and forensic experts.
Pc Harper's grandmother Maureen Shrimpton posted on Facebook, saying: "Just a really disgusting day".
They also searched a BMW parked at the scene.
The most recent case was the murder in 2017 of PC Keith Palmer, who was stabbed during the Westminster terror attack in 2017.
Days later a 42-year-old West Midlands Police officer suffered serious head and pelvic injuries when he was run over with his own vehicle.