LACEY, Wash. -- Police here arrested a student early Thursday morning suspected of e-mailing seven bomb threats to Timberline High School.

Police Commander John Suessman said officers arrested the 15-year-old 10th grade student at his home about 2 a.m.

Detectives seized computers from the home and booked the teenager into a juvenile detention facility for investigation of threats to bomb a school, felony harassment, and identity theft.

In court Thursday, prosecutors said the teen used very sophisticated methods to steal the internet identities of other people, and make it seem like the bomb threat came from them.

The FBI was called in to assist Lacey police in tracing the threats back to the suspect.

The threats from June 4 to June 13 were a growing aggravation for Timberline students and staff, as they were forced to evacuate the school on an almost daily basis.

The school clamped down on students' movements through the school during class, and police were brought in to patrol the campus.

Suessman said no explosives were found during any of the threats and none were found during a search of the suspect's home.