The US Embassy and Consulates in Mexico have restricted government travel to Nogales, in the border state of Sonora, after receiving unspecified threat information. American officials have limited government activity in the city to essential movement during daylight hours only and have warned US citizens of the change in security posture, though no details of the specific threat have been made public.

The restriction was announced by the US Consulate General in Nogales on Saturday, prompting Sonora's State Security Board to contact American consular officials, though it said it had received no information identifying a concrete risk to the public and would maintain existing preventive security measures. The advisory also reiterated that Sonora is designated Level 3, "Reconsider Travel," under the US Travel Advisory system, and urged anyone in the area to stay alert, seek shelter if needed, keep loved ones informed, follow instructions from Mexican authorities and monitor local media. Republican congressman Andy Biggs urged Americans in the area to heed the warnings, but the nature of the threat remains undisclosed.