Two Venezuelan migrants have been arrested after they brutally killed a Mexican border agent when he asked to see their identification papers across the border from El Paso, Texas  — where Tren de Aragua gangbangers have recently threatened to increase violence against US troops on guard.

The federal agent, identified as Luis Alberto Olivas García, was ambushed Monday at a checkpoint in the northern state of Chihuahua, according to Mexico’s National Migration Institute.

The murdered immigration agent suffered an apparent head injury in the assault, with his body also showing “signs of violence,” authorities said.

Two Venezuelan men were taken into custody later Monday, according to state investigators.

The third suspect, a Colombian national, was also detained over the fatal attack, the Mexican migration agency said in a separate statement.

No charges had been filed as of late Monday.

The agent had only just been recognized for his 30 years of service to the federal agency prior to his death, Chihuahua security minister, Jorge Armendárizm, told the New York Times.

Olivas García’s death marked a rare case of deadly violence against agents just weeks before President-elect Donald Trump’s crackdown on illegal immigration is expected when he takes office on Jan. 20.

The fatality comes, too, as hundreds of migrants waited in long lines outside an immigration office in southern Mexico on Monday in a bid to legally enter the US before Trump returns to power.

Venezuelan gangbangers have been mobbing the nearby El Paso border in recent days, vowing to attack US border guards if they try to stop them, according to a Texas law enforcement memo leaked to The Post.

Last week, 20 of the Venezuelan gangbangers tried to rush the area by force to break through the border gate carrying blades, tire irons and broken liquor bottles. The violent groups are also expected to make another violent border rush attempt on New Year’s Day.

With Post wires