Montreal police say a year-long investigation by the major crimes unit has culminated in the arrest of two murder suspects, after a major police operation was carried out Wednesday.

Police arrested seven men between the ages of 24 and 28, seizing firearms, ammunition, cellphones and electronic material.

Two of the men are to appear in court tomorrow to be charged with first-degree murder in the 2016 death of Angelo D'Onofrio.

The 72-year-old man was shot to death on June 2, 2016 outside the Hillside Café, also known as the Sinatra Café, on Fleury Street East.

D'Onofrio was a victim of mistaken identity, according to police.

String of violent crimes

Vincent Rozon, the head of the SPVM's major crimes unit, said in the course of investigating D'Onofrio's death, police were able to track down suspects in several other violent crimes, apparently gang-related. 

''We've just put a halt to these violent acts in the greater Montreal region'', said Rozon. 

Montreal police arrest

Vincent Rozon, head of the SPVM's major crimes unit, says the investigation into D'Onofrio's homicide allowed police to uncover several other violent crimes, seemingly gang-related.

Rozon said the crimes could be linked to the Montreal Mafia.

''This is a hard blow. We've just shaken the core of their structure'', said Rozon.

He said police were able to prevent several other crimes from being committed.

Rozon said the investigation continues.

All seven men will appear in court tomorrow to face a series of charges, including arson, home invasion and fraud.

With files from Radio-Canada's Karine Bastien