Someone claiming to be a Petaluma (Calif.) High School student “hacked into several students’ MySpace accounts at about 10 p.m. Tuesday” and posted threats that he or she would bring a gun to school today and shoot people, NBC11.com reports. The person also made references to the Virginia Tech shootings. The school, which told police that several hundred students received the threatening message, notified parents with a recorded phone message last night, but about 35% of the students were in class today. “In addition to the Petaluma Police Department’s school resource officer there were five to seven additional officers on campus,” according to the TV report, but police said they found nothing suspicious today, and classes are scheduled as usual for tomorrow and Friday. MySpace works closely with law enforcement, with a toll-free number for police requests, so the hacker’s identity could well have been worked out by the time I post this (Wed. evening).