Gulf drug cartel members decapitate rival Zetas! Click below for the full story.

Melissa Nash

New, horrific footage shows members of a Mexican drug cartel beheading hostages from a rival gang, marking the latest act of violence in the growing war over drug-smuggling territories in Mexico.

The 3-minute clip, which was posted on Mundonarco.com Wednesday, shows five shirtless members of the Zetas cartel, marked by black Zs on their chests, kneeling in front of four masked members of the Gulf cartel.

The masked men hold machetes as each Zeta member gives his name.

Each hostage says he was sent by “Z-40,” referring to the Zeta cartel’s second-in-command, Miguel Angel Treviño Morales, who is known as “40.”

“40” and his two brothers are wanted in Texas for allegedly laundering millions of dollars in drug money through a horse racing company, the Houston Chronicle reports.

The U.S. has offered a $5 million reward for any information leading to Morales’s capture.

“You find yourselves here because you came to f— us,” the video’s unidentified narrator says when the Zeta members finish speaking. “Pay attention, men.”

Three members of the Gulf cartel then begin to slowly hack off the heads of the Zetas with their machetes.

“This is how all your filthy people are going to end,” the narrator says as the prisoners plead for their lives.

The video ends a minute later when the masked men hold up three of the severed heads. The two other Zeta hostages are not shown.

“Very good, very good,”the narrator adds.

The grainy clip was shot in Rio Bravo, Mexico, according to Mundunarco.com. Rio Bravo is located about six miles from the U.S. border, just south of McAllen, Texas.

It is unclear when the video was shot.

The Zetas cartel, which once worked as the Gulf cartel’s security force, was founded when the two groups split in 2010, according to ABC News.