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The parents of a 17-year-old boy killed by a tiger at the San Francisco Zoo said the attack has forever ruined Christmas for them, while police are investigating whether someone helped the tiger escape.

The area of the zoo in which the Siberian tiger killed Carlos Sousa of San Jose has been deemed a crime scene, San Francisco Police Chief Heather Fong said.

The zoo's director, Manuel Mollinedo, said officials have not determined how Tatiana, who weighed more than 300 pounds, escaped from her exhibit area and attacked three patrons Tuesday before police shot and killed her. Read full article »

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