WASHINGTON (AP) — The investigation began years ago after two drug dealers got into a car accident in a small Tennessee town. What followed was a series of secret wiretaps, a shootout with police and the discovery of drugs hidden in a tractor trailer that would eventually lead federal investigators back to cartel leaders in Mexico.

The investigation culminated with Justice Department indictments unsealed Thursday against three leaders and two high-ranking enforcers of the United Cartels, a leading rival of Jalisco New Generation Cartel.

The U.S. government is offering a reward of up to $10 million for information leading to the arrest of United Cartels' top leader, Juan José Farías Álvarez — “El Abuelo,” or the grandfather — along with multimillion-dollar rewards for the four others. A

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