Detective Chief Superintendent Richard Bull said: “The investigation team continues to work tirelessly to establish exactly what happened before, during and after this appalling incident.
“I would like to thank them, along with colleagues from other police forces, for their continued support and assistance. It remains crucial that anyone with information about this incident comes forward and speaks to us.”
He continued: “The injured officer was carrying out his duty to protect the public and it is truly abhorrent that this has happened to him.
“We continue to support him as he undergoes further treatment in hospital and are keeping him and his family fully informed of developments in the investigation.
“We would also like to stress that the officer has requested privacy at this time, and we ask that the media respect that wish.”
