Grove Junior High School in Elk Grove Village was expected to have heightened security Thursday after a recent threat was made by a student.
The initial potential verbal threat was reported late last Friday, school officials said.
Police and school officials determined that threat was unfounded. Support is in place for the student involved, officials said.
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On Monday, school officials learned of a Snapchat account used to anonymously make claims about Friday's incident.
That report led officials to a separate group of students.
The account has been shut down, but an investigation continues, school officials said.
Community Consolidated School District 59 will be hosting a social media safety workshop soon for parents.