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WINCHESTER, Conn. (CBS/AP) — Winchester Police say four people brought cupcakes tainted with bodily fluids to their Connecticut school last year.

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Two boys and two girls, whose names are not being released because they were juveniles at the time of the alleged actions, were charged Monday with offenses including fourth-degree sexual assault and second-degree breach of peace.

Winchester police said three suspects are now in college and all turned themselves in after learning of their arrest warrants.

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Police started investigating last June after getting complaints that the students brought cupcakes to The Gilbert School that were tainted with bodily fluids. Authorities have not specified the fluid.

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Authorities say they do not think the substance added to the batter or frosting was toxic and there were no reports of illnesses.

(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)