The suspect in a shooting in Canada that killed a police officer recruited from the UK had been the focus of a lengthy hate crimes investigation, police have revealed.
Edmonton Police Chief Rod Knecht confirmed the death of 35-year-old Constable Daniel Woodall, an eight-year veteran of the force who had worked for the hate crimes unit.
Constable Woodall had served with Greater Manchester Police, prior to his recruitment in Edmonton, in the province of Alberta.
Mr Knecht called the shooting "a tragedy of unspeakable proportions," saying Constable Woodall leaves behind a wife and two young children.
Canadian prime minister Stephen Harper also sent his condolences.
A 38-year-old officer was also shot in the lower back during the same incident, but was saved by his bulletproof vest. He has now been released from hospital.
A fire erupted at the house at the centre of inquiries soon after both officers were shot.
Police identified the suspect as 42-year-old Norman Raddatz, and said he was known to police but did not have an extensive criminal history.
It is believed he died in the house as it burned. A post-mortem examination is due to take place.
Mr Knecht said police had evidence on the suspect going back to February of last year.
"The online hatred and bullying of an Edmonton family had become extreme, and the family members were increasingly worried about their personal safety, at which time the Edmonton Police Service became involved," Mr Knecht said
Mr Knecht said the two officers had been delivering an arrest warrant for criminal harassment at the suspect's home when they were shot at. He said they were pinned down by fire for at least 10 minutes.
"They were breaching the front door and shots commenced," Mr Knecht said.
He said a high-powered rifle was used by the suspect, and more than 50 bullet holes were found in a home across the street.