A special education teacher has been accused of having sex with several of her students who stayed behind after classes.
Summer Michelle Hansen has been placed on administrative while officials try to determine how many of her students she had sex with.
Parents have been told to talk to their children to see if they had any unwarranted contact with the married 31 year old at Centennial High School in Corona, California.
Hansen has been charged with multiple counts of engaging in unlawful sex and oral copulation of a minor.
The exact number of students she had sex with has is not known but police believe there are multiple people she had illegal sexual relations with.
The mother of three came under investigation after a former student at the school came forward to say he had sex with Hansen.
The Corona Norco Unified School District has placed Hansen on leave, according to Superintendent Tom Pike.
'All teachers undergo a thorough background check prior to employment, including clearance from the FBI and Department of Justice,' Pike said.
Parents at the school were stunned by the arrest.
'It surprises me that any 31-year-old adult, married woman is having sex with a child, teacher or otherwise,' said parent Angela Thompson.'Give her fair chance to defend herself, and if that is the case it’s going to be a shame,' another parent, Khoi Pham, said.