The district said it is also working with police, who will be investigating the incident.
It says there is no evidence of inappropriate behavior on school grounds. The district did not specify when or why the staff member is no longer employed with the district.
"Having to share this news is deeply troubling," the district said in a statement. "The St. Francis School District takes great pride in the trust our community has in us to provide a safe learning environment, and we will work as a school community to strengthen that trust."
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