Mexican drug cartels along the Arizona border have been issuing death threats against the Nogales (Ariz.) PD's officers via criminal informants, CNN reports.

The threats were issued following two large drug busts by off-duty officers with the department. Nogales Chief Jeffrey Kirkham learned about the threats via a criminal informant in Mexico who told the agency about a list of officers held by the cartel.

It's the first time the department and its officers have been directly named. Kirkham is encouraging his officers to carry their sidearm and wear body armor while off duty.

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