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Three schools in the East China School District will be closed Friday after a threat was issued, the district said Thursday evening.

Marine City High School, Riverview East High and Marine City Middle School will be closed Friday “as a precautionary measure” after a threat was received at 5 p.m. Thursday, the district said.

The district said Marine City police are investigating “whether or not this threat was related ot an earlier threat made by a student during the school day.”

The district, in St. Clair County, serves students from St. Clair and Marine City, and the townships of China, Cottrellville, East China and portions of Casco, Columbus, Ira and St. Cair, according to its website.

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