Andrew Oberle a Victim of 'Territorial Defense' by Chimps

Andrew Oberle, a 26-year-old Texas graduate student, is recovering after the chimpanzees he was working to protect turned on him in South Africa. (ABC News)

The South African chimp sanctuary where a Texas graduate student was mauled by two chimpanzees last week is safe and has not changed its safety protocols in the wake of the accident, officials said today.

"We still maintain that we are a safe facility," Eugene Cussons, director at the Jane Goodall Institute Chimpanzee Eden near Johannesburg, said today on "Good Morning America." "As far as our protocols go to ensure the safety of visitors coming here, it's still the status quo."

Cussons was one of the first to respond to the calls for help last Thursday after Andrew Oberle, a 26-year-old graduate student who had been spending his summer conducting research at the Institute, was attacked by two chimpanzees after stepping into a restricted area while leading a tour.

Cussons, appearing on "GMA" today just feet from where the accident occurred, provided a tick-tock account of exactly what happened in the scary first moments after he received word of the attack.

ABC News

Andrew Oberle, a 26-year-old Texas graduate... View Full Size

ABC News

Andrew Oberle, a 26-year-old Texas graduate student, is recovering after the chimpanzees he was working to protect turned on him in South Africa.

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"I got the phone call from the sanctuary manager that said to me, 'Listen, we need to invoke lethal force protocol in order to save Andrew's life,'" he said. "So at that point I raced up with a vehicle, got to the scene, spotted the two chimpanzees, immediately jumped out of the vehicle and charged towards them with a handgun and fired two warning rounds into the air."

"Normally this would chase any chimpanzees off that might be in attack mode but these two chimpanzees were highly motivated. They were hyped up. So I retreated back to my vehicle and fired a third warning round out of the window, right next to the chimpanzee that was now about 30 meters from me," said Cussons. "Finally, I closed my window up and the chimpanzee jumped onto the bottom of my vehicle and started beating through my windshield. I was then forced to fire a round at the chimpanzee, warning the chimpanzee because my intention at that point was that I needed to get to Andy so there was no other alternative option. The absolute necessity there was how to save human life."

After the fourth round was fired, the chimps moved away, allowing Cussons and first responders to get to Oberle, who suffered huge cuts to his head and face that left his skull and facial bones exposed.

Oberle, an anthropology major at the University of Texas at San Antonio, underwent six hours of surgery in a South African hospital on Sunday, where he is now in stable condition. His parents arrived to the hospital this morning to be with their son.

"As far as the information that we've received, he is in stable condition," Cussons said. "We are hurting at the sanctuary in the sense that we've witnessed a lot of things and we're very sorry for what happened and we're just so sorry for the family to have to endure this and for Andy to have to go through this."

The Institute's internal investigation of the attack, launched immediately after the attack occurred, shows that the two male chimps, Nikki and Amadeus, responded to an overstepping of boundaries by Oberle who had crossed into a "no go zone" in one of two fences separating him from the animals Oberle did not have clearance to be standing in the area past the public fence, according to Cussons.