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“We are talking massive drug seizures,” said the source, who spoke on the condition of anonymity.

“We are talking about fentanyl labs, steroid labs, shatter labs.”

Shatter is a glass-like marijuana derivative that is smoked, usually via a vaporizer.

“They were also involved in money laundering on a large scale,” said another source, adding police have already seized two high-end vehicles.

Dubbed Project Arbour, Calgary police and detectives with the Alberta Law Enforcement Response Teams (ALERT), who specialize in drugs and gangs, have been pursuing the case for nearly a year.

A major break came when two Calgarians were busted in Utah last year in what was called that state’s biggest ever meth bust.

Photo by Courtesy / St. George News

Postmedia has learned some aspects of the investigation were carried out by undercover operatives.

Sources say the Calgary gang would trade marijuana they smuggled across the border for meth with members of the Mexican cartel.

Final arrests and search warrants were executed in the city earlier this month.

Colin Reitberger, 23, and Anees Amr, 26, were gunned down in front of shoppers at the Superstore on May 21.

Police charged Christian Joffre Ouellette, 20, with two counts of first-degree murder last June, in connection with the fatal shooting at the Superstore parking lot on 130th Avenue S.E.

In December, investigators said they wanted to speak with a man who may have been involved in selling a gun to Ouellette just days before the shooting, in what was then described as a “significant” lead in the investigation.