According to multiple media report U.S. Attorney General Bill Barr was already planning a visit to Mexico prior to a massive cartel gun battle near the U.S. border that has left 21 people dead. .
MEXICO – More than a dozen armored trucks filled with Los Zetas cartel gunmen rolled into a small rural town in the border state of Coahuila. The gunmen spread terror as they attacked the city hall building. The incursion turned into a fierce shootout and several chases where at least 14 cartel gunmen, three civilians, and four police officers died. Preliminary reports point to six additional people sustaining gunshot injuries.

The violence began on Saturday morning. More than a dozen armored trucks, some with machine guns mounted on top, left the border city of Nuevo Laredo, Tamaulipas driving towards the state of Coahuila. The gunmen are members of a faction of Los Zetas called Cartel Del Noreste.

Once in the town, the gunmen drove to the plaza square where they fired several machine guns at the city hall building in a brazen attack that spread terror among local residents. During their attack, several municipal police officers from Villa Union tried to fight off the attackers, however, the gunmen pushed them back and torched several police vehicles.
Authorities called for help leading to a massive deployment of state police officers from various units, and municipal police officers from Piedras Negras, Allende, and several other municipalities who rushed to the scene and clashed with the dozens of Los Zetas gunmen. The cartel gunmen wore body armor and tactical vest emblazoned with the CDN-Los Zetas logo. The armored vehicles that the cartel gunmen used also had similar decals identifying them as members of CDN-Los Zetas. (source)