HILLSBORO, Ore. -- A former Sherwood High School teacher was arrested Monday, accused of having sex with two boys during school hours, at her home and the homes of the boys.

Denise Keesee, 38, was booked into the Washington County jail Monday and held on $120,000 bond, surrendering to police at the facility. She was accused of six counts of second-degree sex abuse.

The alleged offenses date back to 2006, according to Washington County sheriff's office detective Robert Rookhuyzen. She was married to the school's Sherwood police liaison officer, who has not been charged with any crime, he said.

The case was investigated by the sheriff's office to avoid any conflicts, he said.

Very complicated, was how he described the investigation of the math teacher who also coached soccer.

Rookhuyzen said Keesee targeted vulnerable students who knew her husband was the on-campus officer.

Some of the students she worked with were in a program for at-risk youth, Rookhuyzen said, These were young people who had come from broken homes, not doing well in school. And she was able to become buddies with them.

He has been working the case for months, trying to get very reluctant former students to tell their stories. All the alleged victims are now adults but were underage at the time of the incidents they described.

None of the victims came forward willingly and the alleged abuse was reported by those required to report abuse, after rumors started surfacing at the school, he said.

The detective said the role of Keesee's husband as on on-site officer prevented people from coming forward essentially. The officer no longer works at the school.

Rookhuyzen said Keesee confirmed she would date the students, taking them to movies and the park. This was early in the investigation. Keesee later stopped cooperating with police.

She resigned from her teaching position in May 2013. She has been on leave since the allegations first surfaced in November of 2012.

Rookhuyzen said it is likely there are more victims who have not come forward. He urged them to contact the the Washington County Sheriff s Office.

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