Classes will resume at Columbine High School today, one day after a media-hungry telephone caller made repeated bomb threats that led authorities to evacuate the building and cancel classes.

About 9:30 a.m. Thursday, the first of several phone calls came into the high school office, said Jefferson County sheriff's spokeswoman Jackie Kelley. After school administrators consulted with law enforcement officials, they decided to send the school's 1,850 students out of the building, first to a park and then to nearby Leawood Elementary School.

The Jefferson County bomb squad, with two bomb-sniffing dogs from the sheriff's department and Golden police, made sweeps of the building and determined there was no bomb, Kelley said.

By 11:15 a.m., however, school officials had decided to cancel remaining classes as well as after- school activities, including a school musical, night school and athletic practices, said Jeffco Public Schools spokeswoman Lynn Setzer.

Columbine has fielded a variety of threats through letters, e-mails and phone calls in the years since the April 20, 1999, shootings in which students Eric Harris and Dylan Klebold killed 13 people at the school before killing themselves.

Not all of those threats led to canceled classes. Setzer noted that a bomb threat made in 2003, for example, did not result in an evacuation.

"This wasn't the usual threat," Setzer said without elaborating.

Kelley said the caller specifically asked that his threat be reported on CNN.

"He was looking for media attention," she said.