Two U.S. Embassy personnel and two Mexican law enforcement officials died in a car accident in the northern state of Chihuahua on Sunday.

The crash occurred while the group was returning from an operation that dismantled several clandestine methamphetamine laboratories in the municipality of Morelos, according to Chihuahua state authorities. The U.S. staff members, described as instructors from the embassy in Mexico City, were participating in bilateral security training exchanges focused on combating drug trafficking. Their Mexican counterparts included Pedro Ramón Oseguera Cervantes, director of the state's Investigation Agency (AEI), and officer Manuel Genaro Méndez Montes.

Chihuahua Attorney General César Jáuregui Moreno confirmed the deaths, stating that the officials had been involved in a three-month investigation leading to the destruction of six synthetic drug production sites, including one of the largest methamphetamine labs in the country. The operation, conducted on April 17 and 18, resulted in the seizure of industrial equipment, chemical precursors, and other materials used in drug manufacturing.

U.S. Ambassador to Mexico Ronald Johnson expressed condolences in a statement on X, formerly Twitter. "We are deeply saddened by the tragic loss of two U.S. Embassy personnel, the Director of Chihuahua’s State Investigation Agency (AEI), and an AEI officer in this accident," he wrote. "We honor their dedication and tireless efforts to confront one of the greatest challenges of our time." Johnson added, "This tragedy is a solemn reminder of the risks faced by those Mexican and U.S. officials who are dedicated to protecting our communities. It strengthens our resolve to continue their mission and advance our shared commitment to security and justice, to protect our people."

The accident took place in mountainous terrain near the town of Morelos, between Guachochi and the operation sites, state officials said. No further details on the cause of the crash were immediately available, and authorities have not indicated any suspicion of foul play.

Chihuahua, which borders Texas, has long been a hotspot for cartel activity, particularly involving methamphetamine and fentanyl production. The region sees frequent joint U.S.-Mexico efforts to disrupt trafficking networks amid ongoing violence linked to organized crime. The deaths underscore the dangers faced by personnel engaged in these anti-narcotics initiatives.

The U.S. Embassy has not released the names of its personnel, citing privacy protocols. Mexican authorities turned over evidence from the lab raids to federal prosecutors for further handling.