By Tara Molina

NORTHFIELD, Ill. (CBS) — A camera was spotted recording inside a bathroom this week at Sunset Ridge School, an elementary school in north suburban Northfield.

Police on Thursday were sweeping the entire district. And as CBS 2’s Tara Molina reported, police also have an idea who is behind it.

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A cellphone camera was found “hidden and recording from a trash can” in a staff-designated bathroom around 4 p.m. Tuesday, Jan. 14, according to a letter to parents.

We are told students also have access to the bathroom, but the district superintendent wouldn’t address that with us.

The superintendent would not address any other questions or concerns either, while police are investigating.

In the letter to parents, District Supt. Edward J. Stange said, “The police have identified a potential suspect, who had been banned from District 29 property.”

But was it the first time? And are police able to access every video from the phone?

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We asked. A Northfield police sergeant told us they could not share any details right now.

But we do know it’s not the first such incident in the district in the past six months.

This past August, a substitute teacher and teaching assistant at Middlefork School, just down the road, was charged with possession of child pornography.

George Gemeinhardt was just in court on Wednesday for a status hearing. He is out of jail on $3,000 bond.

Northfield police did a full sweep of Sunset Ridge and the school down the street and didn’t find anything else.

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We will follow up with them on their investigation.

Tara Molina