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Mexico’s Sheinbaum warns US involvement in anti-drug operation not to be repeated

By Thomson Reuters Apr 27, 2026 | 10:09 AM

MEXICO CITY, April 27 (Reuters) – Mexican President Claudia Sheinbaum said on Monday that her government told the United States, in a diplomatic note, that the unauthorized ​presence of U.S. officials at an anti-narcotics operation in ‌the northern state of Chihuahua should not be repeated.

The incident came to light after two U.S. officials, along with two Mexican officials, were killed in a car crash on April 19 after the operation. ‌Sheinbaum ​has said the federal government was not ⁠aware of the participation ⁠of the U.S. officials, who sources told Reuters were CIA officers.

“What we told (the U.S.) was that the federal government didn’t know about the involvement of these people (in the ​operation) and we hope that it’s an exception,” Sheinbaum said in her daily morning press conference.

Mexico requested that “from now ⁠on, as has been done, our ⁠constitution and national security law should be followed,” ​Sheinbaum added, saying that the U.S. had indicated its agreement.

On ​Saturday, Mexico’s security cabinet said in a statement that ‌the U.S. officials lacked formal accreditation to participate in security activities in Mexico and that one of them had entered the country as a tourist.

The deaths of the two Americans ⁠rekindled U.S.-Mexico tensions over security cooperation. The presence of U.S. personnel in anti-cartel operations is a deeply sensitive matter in Mexico. Sheinbaum ⁠has long maintained ‌that she welcomes intelligence sharing and security ⁠cooperation but will not accept U.S. agents ​or forces ‌participating in operations on Mexican territory.

In contrast, ​U.S. President ⁠Donald Trump has repeatedly called for greater use of U.S. military force to combat Mexican cartels, and has threatened that the U.S. could go it alone if Washington feels Mexico isn’t doing enough.

(Reporting by Raul Cortes; writing by Kylie Madry; editing ​by Stephen Eisenhammer)