No word yet as to how the tigers were able to get out of their enclosure. No information as to the identity of the victim at San Francisco Zoo tiger attack.

Developing---

More from KTVU:

Authorities said they got a 911 call at 5:17 p.m. reporting that at least one tiger had broken loose from its cage and was prowling the grounds. Heavily armed police officers confronted the tiger inside the Terrace Cafe, killing it as it attacked a man. Three other tigers were found on the grounds and returned to their cages.

San Francisco Fire Department Lt. Ken Smith said at least one had been killed. A critically injured man who had been mauled in the face was treated by emergency workers inside the cafe. Another man -- apparently the brother of the other injured man -- was also being treated at San Francisco General Hospital.

Still no word on as to how the tigers were able to escape their enclosure.

SF Zoo Tiger Attack Update

According to a story by UPI on September 7, the SF zoo had reopened its tiger and lion exhibit after spending $250,000 in safety upgrades to the "dining hall" area. A zookeeper filed a lawsuit alleging that better security could have prevented an attack by a Siberian tiger back in December.

The tiger severely injured Lori Komejan when it managed to tear away the tendon tissue on her right arm.

According to the UPI story the San Francisco zoo had three Sumatran and two Siberian tigers.

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