Tacoma police detectives have arrested a 31-year-old man who, they say, admitted to 11 such incidents motivated by his hatred of teenage girls.

The threats begans in May 1999 at Hunt Middle School and continued this year at Wilson High School. The schools were evacuated on several occasions while they were checked for bombs.

In each case, someone left notes saying there were bombs on the school grounds or that he would show up at the school and start shooting female students.

Detectives set up video surveillance cameras and observed the suspect placing notes at the schools in the early morning hours.

The man arrested, Eric Steve Butcher, is a fast-food maintenance worker. He was booked into the Pierce County Jail, and was being held on felony threat-to-bomb charges.