SAN FRANCISCO -- The trial of a parolee accused of stabbing a 14-year-old girl at a San Francisco bakery in 2007 got under way Tuesday in San Francisco Superior Court.

Scott Thomas, now 29, is charged with two counts of attempted murder, one count of aggravated mayhem and one count of assault with a deadly weapon. He has pleaded not guilty by reason of insanity.

According to police and prosecutors, Thomas, originally from Van Nuys, had been released from San Quentin State Prison the day before the May 19, 2007, stabbing at Creighton's Bakery, near Twin Peaks.

The girl was attacked without provocation, according to prosecutors, and was severely injured but survived. A man who tried to intervene was also stabbed.

A witness followed Thomas from the scene of the stabbing and police arrested him behind Laguna Honda Hospital.

Prosecutors have said Thomas told police he had fantasized about killing people while in prison and planned to commit a murder in Los Angeles but didn't have enough money for bus fare.

Opening statements were scheduled to begin this morning.