Investigators trying to determine how a tiger escaped its enclosure at the San Francisco Zoo - killing one visitor and mauling two others on Christmas - planned a thorough sweep of the zoo grounds Wednesday to look for clues.

Authorities did not believe more people were attacked, but they wanted to inspect the area in the daylight. Zoo officials were still uncertain how long the Siberian tiger, the same one that mauled a zookeeper last year, was loose before being shot dead.

The three men who were attacked Tuesday while visiting the zoo were in their 20s, police spokesman Steve Mannina said. The attack occurred just after the 5 p.m. closing time, on the east end of the 125-acre grounds.

They suffered "pretty aggressive bite marks," Mannina said.

(AP) A zoo visitor watches Tatiana, a Siberian tiger, in this Sept. 7, 2007, in San Francisco. A tiger...
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The zoo was to be closed Wednesday.

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