WASHINGTON (AP) — Defense Secretary Pete Hegseth announced Tuesday that the U.S. military has carried out strikes in the eastern Pacific Ocean on four boats accused of carrying drugs, killing 14 people and leaving one survivor in the deadliest single day since the Trump administration began its divisive campaign against drug trafficking in the waters off South America.

It was the first time multiple strikes were announced in a single day as the pace of the attacks has escalated. The nearly two-month campaign and U.S. military buildup have strained ties with allies in the region and opened speculation that the moves are aimed at ousting Venezuelan President Nicolás Maduro, whom the U.S. has accused of narcoterrorism.

A statement provided by a Pentagon official, who spoke on the condition of anonymity to freely discuss the operation, said the strikes were conducted Monday off the coast of Colombia.

Following one attack on a boat, the military spotted a person in the water clinging to some wreckage. The military passed the survivor’s precise location to the U.S. Coast Guard and a Mexican military aircraft that was operating in the area, the official said.

However, the Mexican navy says it is searching about 400 miles southwest of the Pacific city of Acapulco, suggesting the possibility that the strike may have taken place far away from Colombia and closer to Mexico’s coast. It wasn’t immediately clear exactly where the strike took place, and the Pentagon did not give more details.

Hegseth said Mexican search and rescue authorities “assumed responsibility for coordinating the rescue” of the sole survivor but didn’t say if that person was successfully rescued or would stay in Mexico’s custody or be handed over to the U.S.

Mexico’s navy still was attempting a search and rescue operation, the military said in a statement Tuesday, a day after the strikes occurred. The American attacks drew renewed criticism from the regional ally.

Mexican President Claudia Sheinbaum said during her daily press conference that she asked the foreign affairs secretary and the navy to meet with the U.S. ambassador in Mexico to discuss the issue because “we do not agree with these attacks.”

“We want all international treaties to be respected,” she said.