BISBEE - One of the three undocumented Mexican migrants injured last weekend after a fall down a cliff in the Huachuca Mountains underwent surgery Thursday at a Tucson hospital to treat brain hemorrhaging.

Meanwhile, a second victim is awaiting surgery for a broken back, while a third is recovering from a concussion. The Mexican Consulate in Douglas said Roberto Jimenez Martinez, 30, from the state of Hidalgo, was operated on to stop bleeding in his brain. He remains unconscious and in intensive care at Tucson's University Medical Center.

Alex Hernandez Perez, 19, from the state of Puebla, broke his back in the fall and will face surgery, the consulate said. As of Friday, only a magnetic resonance test and X-rays had been performed on him.

Thirty-four-year old Miguel Munoz Mancinas, from the state of Sinaloa, suffered only a strong concussion in the fall and will not face any surgery.

The three men fell at least 200 feet down a cliff late Sunday as they attempted to escape arrest by the Border Patrol.

Agents were in the process of apprehending a group of approximately 30 illegal immigrants in Oversite Canyon, about three miles west of Montezuma Pass, when the men attempted to flee on foot.

The agents didn't follow because it was dark and the terrain was rough, said Jesus Rodriguez, a spokesman for the Border Patrol's Tucson Sector.

Agents then heard calls for help. Following the sounds, they realized the three men had fallen down a cliff, Rodriguez said.

The agents notified the Cochise County Sheriff's Office and a team of volunteers hiked to the scene and stabilized the injured men for the night.

At daylight, a helicopter from the Arizona Department of Public Safety brought the victims to a landing zone on Montezuma Road, and they were subsequently airlifted to Tucson.