US, Mexico at odds over border firefight The incident occurred during a joint interdiction operation near Garceno, Texas, and has sparked a dispute between the two countries over where the gunfire originated. A dispute has erupted between the US and Mexico over a firefight involving US Coast Guard personnel along the Mexican border in September. The US says its personnel were fired upon from Mexican territory, but Mexico has demanded evidence to support the claim. The incident occurred during a joint interdiction operation near Garceno, a small town in Starr County, Texas. No injuries or damage were reported, and the incident is still under investigation.