SF Zoo Probes Deadly Tiger Attack

Investigators are attempting to figure out how a 350-pound Siberian tiger escaped her enclosure at the San Francisco Zoo yesterday, crossing a 15-foot moat and scaling a 20-foot wall. The tiger, Tatiana, killed a man and severely mauled two others before being shot and killed by police. The surviving victims are listed in critical but stable condition.

It was the animal's second violent incident; she mauled a zookeeper last year. After that attack, Tatiana's enclosure was renovated to correct design concerns cited by state safety officials. A zoo trainer told ABC News yesterday's attack "likely had little to do with hunger" and emphasized that "when they're working with wild animals, they're very hard to control." (More San Francisco stories.)