"A murder investigation has been launched and now there are ten people who have been arrested on suspicion of murder".
"It is the most powerful reminder that police officers up and down the country put themselves at risk every single day to keep us safe".
Thames Valley Police also confirmed today that it has been given an extra 36 hours to question the 10 people now being held on suspicion of murder.
She also announced that that the Government was "accelerating plans" for a new police covenant created to enshrine protections for officers, and said the Home Office was examining ways to better support the families of those injured or killed by criminals.
Another tribute read: "A shockingly sad day".
The 28-year-old newlywed officer died of multiple injuries after he was dragged along by a vehicle while investigating a burglary reported in the village of Bradfield Southend, Berkshire, at around 11.30pm on Thursday night.
"The cause of death is consistent with our current belief that Andrew was caught between a vehicle and the road and then dragged for a distance".
"Our thoughts are with Andrew's friends and family". I can't begin to tell you how we feel.
PC Harper was aged just 28-years-old and was a roads policing officer he loved his job and was a dedicated cop.
PC Harper's death, just a month after his wedding to wife Lissie, has both horrified and united the nation in grief. And was married two weeks ago at a dream wedding.
He said: "Everybody I've spoken to about Andrew talked about the incredible personality he was, what a fantastic police officer, and what a great friend and man he was, and he'll be sorely missed by everybody".
They also searched a BMW parked at the scene.
He said the force's flags are flying at half mast as a sign of respect "in honour and memory of Andrew".
The incident happened at the crossroads of Ufton Lane and Lambdens Hill.
On Friday, forensic investigators could be seen gathering items that lay on the road and taking photographs, and two white tents were erected.
One message described the officer as "Thames Valley's finest".
On Friday evening there was a police presence at a caravan site near Burghfield Common, not far from where the incident took place. The most recent involved Police Constable Keith Palmer, who was stabbed in the 2017 attack on Westminster Bridge and Parliament, which was deemed terrorism-related.
His death came after a police constable was run over by a suspected vehicle thief in Birmingham last week.
Days later, a 42-year-old West Midlands Police officer was run over by his own patrol vehicle in Birmingham after it was stolen by a suspected auto thief, with the officer suffering serious injuries to his pelvis and head.
Prime Minister Boris Johnson called the death of Pc Harper a "mindless and brutal" crime, saying he was "shocked and appalled" by the attack.
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