Naugatuck police are investigating allegations of inappropriate contact between a teacher and students at Naugatuck High School.
Superintendent Sharon Locke confirmed the teacher was placed on leave after school officials received a report alleging inappropriate relationships with students.
School administrators notified the Department of Children and Families and police, Locke said.
"The safety of our students is our highest priority. We take these matters seriously and will take appropriate action as the investigation unfolds," Locke wrote in a statement to NBC Connecticut.
Police confirmed a criminal investigation is underway but did not provide additional details.