The threat made on Snapchat prompted school officials to take extra precautions to protect students at East Leyden High School in Franklin Park and West Leyden High School in Northlake on Thursday.
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The district asked students to stay home for a day of "e-learning" Thursday, cancelling all after-school activities. Classes will be back in session on Friday.
Many students approved of the security measures.
"I think our school is taking our security seriously and I appreciate that. I think they are making a smart move," said West Leyden senior Nathan Agoncillo.
The threats come in the wake of an East Leyden student being stabbed in the neck by another student Tuesday. The student allegedly involved in the stabbing has been charged as a juvenile with attempted murder.
RELATED: 1 student hurt, 1 arrested after East Leyden High School stabbing in Franklin Park; boy stabbed will recover, police say
According to school officials, the online threats appear to be in reaction to that incident.
One entry on Snapchat reads, "Leyden supposed to get shot up tomorrow. Watch out." The post also acknowledged not knowing whether the threat was real and urged everyone to stay safe.
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District 212's superintendent said officials thoroughly investigated the social media threat Thursday.
"We've spoken to over 40 students and families and we're getting to the bottom of it. We don't think there's anything credible in there," said Superintendent Nick Polyak.
Police have been stationed at the schools during the investigation.
Authorities said they closed both campuses after finding threats coming from both schools.
"It's sort of scary, but nothing I'm worrying about right now," said East Leyden senior Nathan Ramones, adding that the thinks it'll be safe to return to school Friday.