The photos are reportedly of girls from all grade levels and are a result of sexting, which is when a person sends sexually explicit messages or photos, usually on mobile devices.
According to the news station, some posts on the website had encouraged young men to upload more photos they may have been sent.
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An investigator for Shrewsbury Police could not be reached for comment Saturday morning. A spokesman for the superintendent also could not be reached.
In a statement provided to FOX 25, the school system indicated it had reported the issue to law enforcement agencies, and "We are asking these agencies to do whatever they can to protect the safety of the students involved."