LONGMONT, Colo. -- Growing rumors about a Columbine-style attack at Skyline High School on May 5 have prompted top officials throughout the school district to meet and discuss how to act and what to do about the threat and other related rumors and concerns.

A spokeswoman with the St. Vrain Valley School District said school officials met throughout the day Tuesday. The district said it wants to send a message to parents and students that it's safe to come to school.

A posting on the MySpace Web site talks about a planned attack on May 5, which is Cinco de Mayo, the day when Mexicans celebrate a military victory over the French.

According to a police report, the post said, "So, for all you people that go to Skyline, please save your lives and don't go to school on May 5th, aka Cinco de Mayo. I already know that I'm not! Repost this if you wanna keep your life safe and anyone else's lives safe!"

A report was filed with Longmont police, but the case was closed because "no crime" has been substantiated, according to the Longmont Daily-Times Call.

A growing number of reports about violence surfaced last week and kept hundreds of students at Skyline, Niwot and Longmont high schools from going to school Friday. Rumors about an attack, planned in retaliation for a recent, fatal gang-related stabbing kept half of the student bodies at Niwot and Skyline high schools at home. At Longmont High School, a third of the students were absent.

Students said that the Cinco de Mayo rumor may have been circulating because of recent immigration tensions at the school and they believed that the principal may be canceling school and holding a teacher planning day.

Skyline principal Tom Stumpf has not yet decided how the school will respond.

Still, the situation has escalated to the point that he and other district principals are meeting to discuss possible options, but they haven't come up with a decision.

St. Vrain superintendent Randy Zila encouraged parents, students and community members to call the school district with any information that could be helpful to police and said that the schools are investigating and checking out every rumor to determine credibility.

Police had followed up on many of the rumors circulating last week, but because most of them were vague, it made it hard to follow any leads. Police remain on high alert because of two gang-related incidents in the past month that left one man dead and another seriously injured.