Mexico seeks evidence after alleged border shooting prompts US troop deployment

Mexico has asked the United States to provide evidence after Washington said shots were fired from the Mexican side of the border at US security personnel. The dispute centres on an alleged incident near Texas, opposite the Mexican state of Tamaulipas, in late September. The claim has triggered a visible military response on both sides of the frontier and renewed friction over border security cooperation.

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Mexican President Claudia Sheinbaum said in her daily news conference that her government had received a report of shots coming from the Mexican border, but that Mexico had found no evidence to support the allegation. She said the National Guard, Army and Navy had not detected any shots being fired from Mexican territory towards the United States. Sheinbaum added that Mexico had asked for all available evidence, saying: "We asked for all the evidence because we have no evidence." The US ambassador to Mexico said on social media that the alleged shooting targeted members of the US Coast Guard and that the threat would be swiftly addressed.

He also said the US embassy was helping coordinate with Mexican forces deploying to the border area where Coast Guard personnel were fired upon. According to the same account, about 500 US troops have been sent to the border, along with helicopters, drones and anti-drone equipment. Mexico has also sent its own deployment to the area as part of a joint operation called Operation Mirror.

The episode matters because it touches on one of the most sensitive issues in the bilateral relationship: who controls security along the shared border and how far each side can act without undermining the other's sovereignty. Sheinbaum has said she is concerned about US officials overstepping norms on security cooperation. The latest dispute comes as Washington has taken a more active role in regional security, citing efforts to combat narcotics trafficking and criminal organisations.

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The ambassador involved is a former US Army Green Beret who later served in the Central Intelligence Agency and has been in post since May 2025. He and Sheinbaum have repeatedly disagreed over border security and national sovereignty. The current deployment also reflects a broader pattern of closer military and surveillance activity along the frontier, with both governments seeking to prevent further incidents while maintaining cooperation.

What remains unclear is whether shots were in fact fired from Mexican territory, and if so, who was responsible. Mexico says it has no evidence so far, while the US has described the incident as an attack on Coast Guard personnel. The next developments are likely to depend on whether both governments share verifiable evidence and whether the joint border operation reduces the risk of further escalation.

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