Mexican cartel ops disrupted by Trump's border crackdown as US issues do-not-travel warning

As the United States beefs up security at its southern border as part of the Trump administration's illegal immigration crackdown, the State Department has issued the highest-level travel advisory for a specific region of northeastern Mexico near McAllen and Brownsville, Texas.

Amid gun battles, kidnappings and other crime, the State Department is also warning of IEDs on dirt roads in the Mexican state of Tamaulipas.

"[T]he state of Tamaulipas has issued a warning to avoid moving or touching improvised explosive devices (IEDs), which have been found in and around the area of Reynosa, Rio Bravo, Valle Hermoso, and San Fernando along dirt and secondary roads," a State Department travel advisory for Tamaulipas reads. "IEDs are being increasingly manufactured and used by criminal organizations in this region."

The U.S. Consulate in Mexico notes in the advisory that an IED destroyed an official Mexican government vehicle in Rio Bravo on Jan. 23, injuring its occupant.

A Spanish flier published by the Tamaulipas government on Facebook urges the public not to touch or move suspicious-looking devices along the roadside.

U.S. government employees are prohibited from traveling "in and around Reynosa and Rio Bravo outside of daylight hours and to avoid dirt roads throughout Tamaulipas," the advisory states.

Government employees also cannot travel between cities in Tamaulipas using interior Mexican highways.

"Travel advisory Level 4 is the highest level there is," said former DEA Senior Special Agent Michael Brown, currently the global director of counter-narcotics technology at Rigaku Analytical Devices. "That's a warning: Do not go there. I have experienced that, but it was in countries like Pakistan, Afghanistan, Iran, Somalia. … The area we're talking about is the state of Tamaulipas, within which you have Reynosa and Matamoros, which have a history of extreme violence in Mexico."