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Updated

U.S. government employees in Tijuana, Mexico are being instructed to shelter in place after a sudden outbreak of violent crime. 

Mexican law enforcement is investigating a series of vehicle fires and reports of violence in the area. The sudden outbreak of apparent arson has spooked officials and raised questions on the motive. 

The U.S. government has ordered employees to stay sheltered and out of public places as a precaution. 

Vehicle was set on fire in Tijuana, Baja California, Mexico

Firefighters work at the scene of a burnt collective transport vehicle after it was set on fire by unidentified individuals in Tijuana, Baja California state, Mexico, Aug. 12, 2022.  (Guillermo Arias/AFP via Getty Images)

"The U.S. Consulate General Tijuana is aware of reports of multiple vehicle fires, roadblocks and heavy police activity in Tijuana, Mexicali, Rosarito, Ensenada and Tecate," the consulate said. "U.S. government employees have been instructed to shelter in place until further notice."

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The consulate recommended U.S. government employees "avoid the area, seek secure shelter if in the area, monitor local media for updates, be aware of surroundings and notify friends and family of [their] safety."

Mexican National Guard members patrol in Tijuana

Armed members of the National Guard drive past the site of a burnt collective transport vehicle after it was set on fire by unidentified individuals in Tijuana, Baja California state, Mexico, Aug. 12, 2022.  (Guillermo Arias/AFP via Getty Images)

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The Jalisco New Generation Cartel threatened mass violence against anyone who is caught on the streets over the weekend in Northern Baja California, according to FOX 5 San Diego.

"Be warned. As of Friday at 10 p.m. through Sunday at 3 a.m. we’re going to create mass chaos so the (expletive) government frees our people. We’re the Jalisco New Generation Cartel, we don’t want to hurt good people but it’s best they don’t go outside, we’re going to attack anyone we see on the streets on these days," the warning read in Spanish.

Mayor Montserrat Caballero Ramírez told the press that at least 10 vehicle fires had been reported and that both police reserves and national guard units were ready to deploy if necessary, according to NBC 7 San Diego.

Vehicle was set on fire in Tijuana, Baja California, Mexico

People look at a burnt collective transport vehicle after it was set on fire by unidentified individuals in Tijuana, Baja California state, Mexico, Aug. 12, 2022. (Guillermo Arias/AFP via Getty Images)

Tijuana has long been embroiled in domestic and international investigations of violent crime and drug trafficking.

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Earlier this year, U.S. authorities announced the discovery of a massive tunnel stretching under the U.S.-Mexico border that was likely used to transport drugs undetected.

The "fully operational"  tunnel, more than 1,700 feet long, runs from Tijuana to an industrial warehouse in San Diego

Authorities said it contains a "sophisticated" structural system that was likely used to smuggle heroin, methamphetamine and fentanyl into the U.S.

Fox News' Adam Sabes contributed to this report.