A court has been shown National Police Helicopter (NPAS) footage of the moment when various suspects were arrested moments after his colleagues found PC Andrew Harper.
The footage, released by Thames Valley Police, shows the view from a police helicopter as it hovers over the Four Houses Corner Caravan site.
Officers can be heard speaking to each other over the mainset radio as resources rush to the area to find the suspects.
At the beginning of the footage, a bright heat source can be seen in the centre of the screen as the flight observer zooms in to get a better look at the source of the heat.
The heat source turns out to be a fire which was burning on the caravan site, which is discernable when the flight observer changes the mode of the camera from infrared to visible light.
Meanwhile, three additional armed response vehicles (ARV) can be heard to confirm that they are also making their way to the scene.
The police had spotted a Seat Toledo as being connected with the incident, and the police helicopter (callsign NPAS 16) confirms to the Thames Valley Police control room that a Seat Toledo vehicle had been found.
Various people can be seen around the vehicle, identifiable also by their heat sources.
Once the aircrew circulates the information over the mainset radio, control room staff instruct all units involved in the incident who aren’t already dealing with any of the scenes to make their way to the Four Houses Corner caravan site.
A supervisor then reminds units that the suspects have already ‘seriously injured one of our officers’, not knowing at the time that PC Harper would succumb to his ‘catastrophic’ injuries in the road surrounded by his colleagues who had found him after he was flung from the vehicle which had made off from PC Harper and his colleague.
At 23:45, an officer can be heard to update units that the incident is “very serious” – this was still before it was known by the responding units that PC Harper would succumb to his injuries.
Police officers confront the suspects on the Four Houses Corner Caravan Site moments after PC Harper was pronounced dead.
Two police vehicles then enter the traveller’s site as they are guided to where the Seat had been parked.
The flight observer points out to the ground units that he had not seen the heat sources “by the vehicle” but that they were “the only ones around”.
Once it is confirmed that the Seat is the same one that police are searching for, officers request all units to make their way to the caravan site to ‘secure’ it.
The flight observer tells officers that the four individuals spotted in the locality of the Seat had gone to some kennels located on the site and removed their dogs as additional units arrive at the caravan site.
The last bit of the footage appears to show several officers confronting several suspects as one of them stands next to his dog.
Prosecutor Jonathan Polnay read a statement by Thames Valley Police firearms officer Nick Kluger, who said he felt “an immense sense of dread and an urgency” when he heard an officer was down.
PC Kluger and other officers used a defibrillator to try to save PC Harper and he “said something like: ‘Stay with me, buddy, the ambulance will be here soon and they’ll sort you out'”.
He said he felt “elation” when paramedics arrived, but PC Harper’s injuries were deemed “incompatible with life”, and he was pronounced dead at 23:45 BST.
PC Andy Kemp, who responded to the quad bike theft report, told the jury he saw a car come “straight through the junction” of Lambdens Hill with the A4.
The court heard PC Kemp saw “no lights on the car at all” and he saw something that made him think that “they had stolen a cash machine”.
As he turned into Ufton Lane, he noticed some “ratchet straps” on the ground and a body which “appeared to be tumbling”.
Henry Long, the car’s driver, and two 17-year-olds deny murder.
Long has previously admitted manslaughter and conspiracy to steal a quad bike.
On Monday, the two 17-year-olds, who cannot be named due to their age, pleaded guilty to conspiracy to steal a quad bike.
They also deny manslaughter. The trial continues.
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