LOS ANGELES (MCT) — Orange County prosecutors are asking that a University of California, Irvine, professor accused of setting fires at his son’s high school be held without bail after investigators discovered emails in which he allegedly outlined plans to kill officials and students.

Rainer Klaus Reinscheid, 48, of Irvine, was arrested July 24 on felony arson charges in connection with a series of fires set at University High School, the nearby Mason Park Preserve and the home of an assistant principal this month, according to the Orange County district attorney’s office.