An earlier decision to cancel classes Friday because of the threat has been rescinded, and officials say classes will go on as scheduled.
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Police say the investigation began back on June 29 after a tipster pointed out an Instagram post, in which someone wrote: "On September 7 I will shoot up Upper Darby high school."
Investigators had not been able to find the person who posted the threat, so police met with school officials on Wednesday.
A decision was subsequently made to cancel classes.
However, police then received another tip about the message, which helped them track down the person who posted it.
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That person has been identified as a 14-year-old boy from Upper Darby. The ninth-grade student was taken into custody later Wednesday.
School officials now say classes will go on as scheduled at Upper Darby High School on Friday, September 7.
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