Nogales police threats

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The police chief in Nogales, Arizona is telling his officers to carry their guns at all times after drug smugglers threatened two off-duty officers.

The pair was riding horses when they stopped a car with hundreds of pounds of marijuana inside.

The smugglers ditched the vehicle and headed back to mexico, but reportedly vowed to retaliate against the officers.

The police chief considers it a credible threat. In response-- the border patrol sent more agents to the stretch of desert -- where the suspects were stopped.