A 13-year-old boy is among the ten people who have been arrested on suspicion of murder.
He said:"All our thoughts - and the thoughts of the entire police family across the UK - are with the family, friends and close colleagues of PC Andrew Harper, who died last night.
"Sadly on very rare and horrendous occasions a colleague makes the ultimate sacrifice. We will ensure that heroism is never forgotten." He added:"This is a tragic loss for the force and I know that Thames Valley Police are doing all they can to support those who have been affected."
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