Federal authorities said Wednesday they seized more than a half-ton of methamphetamine and indicted 15 people following a two-year investigation that disrupted a drug trafficking organization from Mexico operating in Colorado.

Eleven people have been arrested, but four others including the organization’s alleged leader remain free and are believed to be in Mexico, the Colorado U.S. Attorney’s Office announced.

Dave Olesky, Drug Enforcement Administration special agent in charge, said in a news conference that the investigation revealed ties “to elements in Mexico involving the Sinaloa and Jalisco cartels.” Olesky did not take questions, and an agency spokesperson declined to elaborate.

U.S. Attorney for the District of Colorado Peter McNeilly, joined by local and federal officials, an

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