Investigators on Wednesday will try to determine how a Siberian tiger escaped from her enclosure at the San Francisco Zoo the day before, killing one zoo visitor and mauling two others, CNN reported.

Authorities planned a thorough sweep of the grounds to look for clues they may have missed in the dark Tuesday evening, according to The Associated Press.

Police shot and killed the tiger, San Francisco Fire Department Lt. Mindy Talmadge said. The surviving victims were transported to San Francisco General Hospital, she said.

Dr. Eric Isaacs said the two injured men, ages 19 and 23, were in serious but stable condition with multiple lacerations.

"I believe there was probably some blood loss at the zoo, but here they are talking, they are alert, their vital signs are stable at this time," Isaacs said.

He said that both could be released as early as Wednesday.

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