Eric Norman Olsen, 28, told detectives Friday that he molested between 100 and 200 elementary school students since becoming a teacher three years ago, said police Detective Diane Galindo. He was scheduled to be arraigned August 8.

A phone number for Olsen's residence could not be located. It was not immediately clear whether he had an attorney.

The probe began on June 13 after a male student allegedly witnessed Olsen molest the 10-year-old girl and told school officials, Galindo said. Olsen did not have a criminal background.

Police were asking the public to help identify whether there were other possible victims by contacting local police or school districts.