Mexico has requested evidence from the United States following a late-September cross-border shooting along the Rio Grande.
On Sept. 26, personnel from Coast Guard Forces Rio Grande were intercepting migrants crossing the river when they came under fire from the Mexican side and returned the shots.
That exchange of gunfire along the Rio Grande has triggered a military buildup along the Texas-Mexico frontier and set off a diplomatic clash between Mexico City and Washington.
No injuries or equipment damage were reported during the encounter near Garceño, Texas. Yet the skirmish prompted the U.S. military to reposition hundreds of service members and equipment to the Rio Grande Valley under an operation known as Ardent Vanguard.
Authorities have historically struggled to maintain order around the Garceño area due to its close proximity to Tamaulipas, a Mexican state, and its easily traversable, shallow river crossings. In the days after the shooting, troops were dropped onto islands in the Rio Grande by Chinook helicopters. Around the time of the alleged shooting, roughly 500 U.S. service members were dispatched to the border alongside anti-drone units, drones, and helicopters.
Mexico Demands Proof and Deploys 500 Troops to Tamaulipas
Mexican President Claudia Sheinbaum publicly questioned the U.S. account during her daily press conference, stating that she asked for all the evidence because her government has no evidence.
In response to the reported violence, Mexico deployed 500 Army and National Guard personnel to five municipalities in the border state of Tamaulipas: Nueva Ciudad Guerrero, Mier, Miguel Alemán, Camargo, and Díaz Ordaz.
Sheinbaum added that Mexico’s National Guard, Army, and Navy detected no gunfire originating from Mexican territory toward the United States.
The Mexican forces arrived supported by two UH-60 helicopters, drones, and mobile and semi-fixed counter-drone equipment. The move forms part of a synchronized security initiative known as Operation Mirror, or Concurrent Operation, where forces from both nations patrol their respective sides of the frontier simultaneously.
The Naval Sector of Matamoros, Tamaulipas, is also contributing to northern border security through Operation Saber, deploying 159 naval personnel, 11 vehicles, and two drones for surveillance and protection duties.
U.S. Ambassador Ronald Johnson Coordinates Mirror Patrols
U.S. Ambassador to Mexico Ronald Johnson announced the U.S. response on social media, noting that the embassy was helping coordinate with Mexican units deploying to the affected border region.
The U.S. Embassy in Mexico is helping coordinate with Mexican forces deploying to the border area where U.S.
Ronald Johnson, U.S. Ambassador to Mexico, via Aljazeera
Johnson added that the concurrent deployments aim to patrol both sides of the shared border, protect local communities, and increase the difficulty for criminal and terrorist organizations to operate in the area. Military commanders from Mexico’s XI Military Region and 8th Military Zone established direct communication with the U.S. Joint Task Force-Southern Border to manage the joint effort.
The Coast Guard issued a statement emphasizing that it treats threats against its personnel with the utmost seriousness, noting that it collaborates with the Texas Military Division, the Department of Defense, and Border Patrol to safeguard the border and counter illegal operations.
Questions Surround the Rio Grande Shootout
Federal authorities have not publicly identified the shooters, and no suspects have been publicly identified despite the rapid mobilization of hundreds of troops.
When asked whether the gunfire was linked to drug cartels, Texas Gov. Greg Abbott declined to confirm the connection directly, telling reporters that it was what he had heard. Meanwhile, Hector Garza, a vice president of the National Border Patrol Council, stated his belief that cartels were involved, though the official Coast Guard investigation remains ongoing.