The Border Bandits

Desert Golf in Green Valley, Ariz., just outside Tucson is a lush oasis for legions of retirees. But just beyond the back nine is the front line of what authorities here call an "all out war."

"This is it right here, this is where the ambush occurred?" CBS News chief investigative correspondent Armen Keteyian asked Detective Juan Carlos Navarro of the Pima County Sheriff's Department.

"Yeah - this was where it happened," Navarro said.

Just before dawn on the morning of March 30th, these two men, were camped on a hilltop, waiting, looking to hijack a truck full of marijuana said to be moving north along an old smuggling route that cuts across Green Valley - some 40 miles from the Mexican border.

"They open fire at least 65 times," he said. They used automatic weapons.

"They are using AK-47s, yes," he said.

Twenty-three rounds blistered the Ford Pick-up, a truck packed not with drugs but with people, 25 illegal immigrants. Two were left dead and three wounded, including a young child.

It was the work of so-called Bajadores, modern-day desert bandits.

"There's no way we come here without our body armor and long rifles," Navarro said. "You never know they could be up top, you could get ambushed"

He said rival gangs of heavily-armed bandits are increasingly at war all across his county - ripping off valuable loads of drugs and human cargo. The illegals are often held hostage until families back home pay thousands of dollars in ransom.

"Over the course of the last year it's become a lot more violent," said Sgt. Jim Murphy, who heads the Pima County border crimes unit. "What bleeds across here spreads out across the whole United States."

A special squad formed a little over a year ago to crack down on the latest - and most violent twist - in the smuggling trade. Five nights a week, just seven deputies play a cat-and-mouse game with the desert bandits across 9,000 square miles of rugged terrain.

"For the most part, we're looking for any type of SUV that's coming through this area," Murphy said.

Two to three hundred bodies are recovered out here every year - a dozen in recent months dying at the hands of bajadores.

CBS News has learned the violence is not only directed from south of the border. Sources say the brains behind these bandits are now living in the United States, and that one Phoenix nightclub was used to recruit the two men now under arrest for the Green Valley murders.

"It worries me for the retirement people because they actually come to Green Valley to retire and now they have to deal with this," Murphy said.

It is an all-out war that is moving from the remote desert, to America's backyard.