Zoo experts don’t see how cat could escape on its own
By John Woolfolk, Dana Hull and Barbara Feder Mercury News Article Launched: 12/27/2007 01:38:38 AM PST Authorities were at a loss Wednesday to explain how a 350-pound Siberian tiger escaped its San Francisco Zoo enclosure on Christmas, killing a San Jose teenager and badly mauling two other men before police shot it to death. But…