Two U.S. soldiers were confronted and one disarmed at gunpoint earlier this month by Mexican troops operating on the American side of the border, military officials confirmed Wednesday.

The April 13 incident near Clint, Texas, unfolded when Mexican soldiers apparently believed the U.S. troops, who were inside an unmarked Customs and Border Protection truck, had crossed into Mexican territory. The confrontation was first reported by Newsweek.

A Mexican soldier reportedly took the service pistol from the hip of one of the American soldiers.

President Trump blasted Mexico over the incident Wednesday and said that it’s likely the Mexican troops were actually on the U.S. side of the border to protect illegal drug smugglers.

“Mexico’s soldiers recently pulled guns on our National Guard Soldiers, probably as a diversionary tactic for drug smugglers on the border,” the president tweeted. “Better not happen again! We are now sending ARMED SOLDIERS to the Border. Mexico is not doing nearly enough in apprehending & returning!”

The confrontation between the two sides took place south of the border fence but north of the actual border itself. The Mexican soldiers who approached the U.S. forces reportedly drew their weapons and ordered the American troops out of the vehicle.

An incident report describing the incident and obtained by Newsweek said the U.S. soldiers were “gently searched” by Mexican forces, and that the Mexican forces did not have any military identification on their uniforms other than Mexican flags.

U.S. Northern Command, which is coordinating military assistance to CBP on the border, said an investigation is ongoing.

“After a brief discussion between the soldiers from the two nations, the Mexican military members departed the area,” Northern Command said in a statement.. “The U.S. soldiers immediately contacted CBP, who responded quickly. Throughout the incident, the U.S. soldiers followed all established procedures and protocols.”

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