UK: Investigation launched after killing of Thames Valley police officer

M/S Police lights marking blood trail, Sulhamstead
C/U Forensic officers searching car
M/S Long blood trail
C/U Forensic officers next to car
M/S Blood trail
W/S Crime scene at Ufton Lane
M/S Blood trail
W/S Forensic officers search the scene
C/U Forensic officer searching scene
C/U Road closed sign
C/U Forensic officer at the scene
W/S Police at the scene
SCRIPT
A murder investigation was launched on Friday into the killing of a police officer in Sulhamstead, Berkshire, according to a Thames Valley Police statement.
Footage shows forensic units taking samples of blood stains on the road as well as officers cordoning off the road where the investigation into the Thursday killing is taking place.
The victim, whose name was Andrew Harper, was reportedly killed after being dragged along by a car after he was hit by a vehicle while responding to a burglary at around 23:30 local time on Thursday.
Ten suspects have been arrested and remain in custody, Thames Valley Police said in a statement.