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. Last Updated: 07/27/2016

Tigers Kills on Zoo Rampage

APTatiana, a female Siberian tiger, escaped from her cage in San Francisco.
SAN FRANCISCO -- The San Francisco Zoo was closed Wednesday as investigators tried to determine how a tiger escaped from its enclosure and attacked three visitors, killing one of the men and mauling two others.

Officials said additional victims were not likely but they were uncertain how long the tiger, a female named Tatiana, had been loose on Christmas Day before she was killed by police.

Tatiana, a Siberian tiger weighing 135 kilograms, ripped the flesh off a keeper's arm just before Christmas 2006.

The three men were attacked just after 5 p.m. Tuesday, police spokesman Steve Mannina said. They suffered "pretty aggressive bite marks," he said.

The two injured men were in critical but stable condition Wednesday, authorities said. They had bites and claw cuts on their heads, necks, arms and hands.

The San Francisco medical examiner had not been able to identify the dead man, investigator Tim Hellman said Wednesday. The man did not have any identification and no one had called asking about him, according to Hellman.

The zoo's director of animal care and conservation, Robert Jenkins, could not explain how Tatiana escaped. The enclosure is surrounded by a 4.5-meter-wide moat and 6-meter-high walls, and she did not leave through an open door, he said.

"There was no way out through the door," Jenkins said. "The animal appears to have climbed or otherwise leaped out of the enclosure."