New Delhi, June 23 -- A shooting in a predominantly Jewish neighbourhood of Montreal on Monday left three people dead, including a police officer, a local resident and the suspected gunman, prompting a major security response and an ongoing investigation into the motive behind the attack.

Authorities said the incident occurred shortly before midday in the Cote-des-Neiges area, a district known for its kosher restaurants, supermarkets and large Jewish community.

Montreal police confirmed that one of their officers was killed while responding to the incident.

"It is with immense sadness that we confirm the death of one of our police officers in the line of duty," the Montreal police said in a statement posted on social media.

Police lat...