Police responded to the four Lincoln-Way high schools Monday morning after receiving a call threatening Central High School in New Lenox.
District 210 administration called parents to say that school was "proceeding as normal" and that additional police were at all four schools.
Lincoln-Way spokeswoman Stacy Holland said an anonymous man called the Will County Sheriff's Department and threatened the high school early Monday morning before classes started.
A caller threatened to bring guns to the school on March 6, and police believe it was the same person who called 911 today. In that incident, an untraceable phone was used and police weren't able to track the call.
The Sheriff's Department didn't immediately return phone calls seeking more information.
"They quickly determined it was the same caller they're working with other levels of law enforcement to try to apprehend the guy," Holland said.
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