Travel restrictions have been placed on US government employees in the Mexican border city of Nogales, Sonora, according to officials.

The US Embassy and Consulates in Mexico on Saturday issued a warning restricting government activity over an unspecified threat in Nogales, Sonora, in Mexico.

“Due to threat information, US government activities in, and travel to, Nogales have been restricted to essential movement during daylight hours only,” the US Consulate General in Nogales said in a statement.

“We are alerting US citizens of this threat and change in posture,” the statement continued.

Sonora’s State Security Board said it contacted US…

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