MEXICO CITY (AP) — Mexico's president described the slayings of five men caught on security camera footage as an apparent "execution" by soldiers, and vowed Wednesday that the perpetrators would face justice.

President Andrés Manuel López Obrador is a staunch supporter of the armed forces who has insisted that under his administration they have shed any previous tendency toward human rights abuses. He said Wednesday that the slayings in a northern border city last month were impermissible, and that soldiers involved were being were being turned over for prosecution.

Video from a store security camera that was published this week showed a black pickup truck crashing full speed into a wall in Nuevo Laredo. A Mexican military truck apparently pursuing it arrived shortly thereafter and ran into the passenger side of the pickup.

The occupants of the truck were dragged out, kicked and forced up against a wall. They were later found dead.

"Apparently this was an execution, and that cannot be permitted," López Obrador said at his daily news briefing. "Those responsible are about to be turned over to the appropriate authorities."

López Obrador has given the military an unprecedented role in everything from law enforcement to infrastructure projects, as well as running trains and airports. He has staunchly defended the army's honesty, but the military continues to be dogged by complaints of human rights abuses, especially in Nuevo Laredo, across from Laredo, Texas.

The Defense Department issued a statement late Tuesday saying it was cooperating with civilian prosecutors in the case, and had started an investigation of possible violations of the military code. Under Mexican law, abuses by soldiers involving civilians go through civilian courts.

The video, originally reported Tuesday evening by U.S.-based Univision and Spain's El Pais newspaper, is apparently security camera footage showing the daytime incident in Nuevo Laredo.

After chasing and crashing into the pickup truck, soldiers pull five men from the pickup, disarm and kick them, and then line them up against the wall.

Soldiers then turn back toward the road and appear to open fire. Their apparent attackers are out of frame. Some soldiers while sheltering behind the pickup, turn their guns on the men against the wall.

Later, the soldiers walk around the scene calmly. One, using a red bag — apparently to avoid leaving fingerprints — picks up guns and places them next to the bodies.

The incident would be at least the second case of apparently extrajudicial killings in Nuevo Laredo this year. On Feb. 26, soldiers killed five young men who were riding inside a vehicle.

The men were apparently unarmed and in a report, Mexico's governmental human rights agency said the soldiers had fired into the vehicle without giving verbal orders for it to stop. Angry neighbors attacked the soldiers, beating some of them.

In April, federal prosecutors charged four soldiers involved with homicide.

That same month, a human rights organization in Nuevo Laredo sent a formal complaint to President Andrés Manuel López Obrador. In it, a man said Mexican National Guard troops had fired on his vehicle in Nuevo Laredo killing his pregnant 15-year-old girlfriend and a 54-year-old friend and wounding two others. A law enforcement crime-scene report on the incident largely corroborated the account of the shooting contained in the complaint.

López Obrador claims the army has changed since the killing of 22 suspects at a grain warehouse in Tlatlaya in the State of Mexico in 2014.

While some of the 22 died in an initial shootout with an army patrol — in which one soldier was wounded — a human rights investigation determined that at least eight and perhaps as many as a dozen suspects were executed after they surrendered.

Seven soldiers were arrested, freed and then arrested again years later on charges of abuse of authority.