Canadian authorities are searching for an unidentified person or organized crime group who stole more than $20 million worth of gold earlier this week in what some have labeled one of the biggest robberies in Canadian history.

According to the Toronto Sun, authorities initially said that an unknown person or group moved 3,600 pounds of the precious metal through the Pearson International Airport in the Toronto area of Canada, which customers around the world often use to move mined gold. The outlet reported that the airport handles 45% of Canada’s air cargo traffic from 175 countries worldwide.

Peel Regional Police told Bloomberg News that a plane carrying a container with more than C$20 million ($14.8 million) in gold and other “high-value goods” was taken from a cargo holding area of the airport.

“An aircraft arrived here at the airport in the early evening,” Inspector Stephen Duivesteyn said. “As per normal procedure, the aircraft was unloaded, and cargo was transported from the aircraft to a holding cargo facility.”

“This is very rare,” Duivesteyn said, adding the gold was removed by “illegal means.”

The Sun reported authorities allegedly believe the movie-like heist was carried out locally and have launched an investigation into organized crime groups in the region, which has been known to have either people or allies placed at Pearson, monitoring airport activities.

The outlet said investigators don’t believe the gold was stolen to fund terrorists, asserting that authorities would have shut down portions of the airport as soon as they became aware of the robbery.

“We feel this to be an isolated incident,” Duivesteyn said. “For the public worried about flying out, there should be no concern. We do not consider this a threat to public safety.”

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Investigators, however, do not know if someone stole the gold from the back of an employee’s pickup truck or smuggled it out of the country through various international flights.

Pearson International Airport has a history of gold heists, according to The Sun, dating back to 1952 when only four out of ten boxes showed up that were bound for Montreal. At least four other schemes took place at the airport, with one heist that saw $68.5 million worth of gold at the time, or about $164.6 million today.

Federal law enforcement officials revealed in new court documents some of the sadistic acts of violence that the four sons of former Sinaloa drug cartel leader Joaquin “El Chapo” Guzman inflicted on anyone who got in their way.

The four sons — Ivan Guzman Salazar, 40, Alfredo Guzman Salazar, 37, Joaquin Guzman Lopez, 36, and Ovidio Guzman Lopez, 33 — who are known collectively as the Chapitos, were indicted by the Department of Justice last week with multiple crimes, including Conspiracy to Distribute Controlled Substances; Continuing Criminal Enterprise; Conspiracy to Import Controlled Substances; Conspiracy to Distribute Controlled Substances for Purpose of Unlawful Importation; Distribution of a Controlled Substance; Conspiracy to Commit Money Laundering; Use and Possession of a Firearm During a Drug Trafficking Crime.

Only one of the sons, Ovidio, is in custody, but he has yet to be extradited to the United States. The other three brothers remain on the run.

Prosecutors say that the brothers have their enemies tortured to get information out of them, and that after they have what they need, the victims are sometimes fed “alive to tigers” that the brothers keep as pets on their ranches. One victim was tortured for two hours, having their muscles ripped out with a corkscrew and having hot chilies placed in their open wounds and nose, prosecutors say.

The brothers “use their powerful security apparatus to demolish unsupportive businesses, capture contested territory, intimidate civilians, and attack law enforcement.”

The brothers “lead the most powerful faction of the Cartel and the largest, most violent, and most prolific fentanyl trafficking operation in the world.”

The indictment describes in detail how the brothers import the precursor chemicals to make fentanyl from communist China into Mexico and then send them to clandestine labs in Mexico, some of which are large-scale facilities located underground, where the chemicals are manufactured into fentanyl.

“The Chapitos’ sicarios comprise a security apparatus built to commit acts of violence in order to protect the Chapitos’ operation and its leaders, territory, labs, trafficking routes, and money,” the indictment said. “These sicarios regularly use military-grade weapons, including machineguns, to perpetrate violence, including murder, torture, and kidnapping.”

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The cartel is the most dominant drug trafficking organization in the Western Hemisphere and has the largest international operations of any drug trafficking organization in the world, operating in 45 countries.