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UPPER DARBY, Pa. (CBS) – The Upper Darby Police Department says they have made an arrest in connection with online threats made against Upper Darby High School.

During a press conference Thursday morning, police said a 14-year-old freshman allegedly posted on Instagram that he planned to shoot up the school on Friday, Sept. 7.

Investigators say the threat was brought to their attention via email on June 29. Police were alerted of the threat again after another student reported seeing a shooting threat on Instagram. Upper Darby Police Chief Michael J. Chitwood said the alleged post read, “On September 7 I will shoot up Upper Darby High School.”

Credit: CBS3.

During the investigation, police informed school officials about the undisclosed threats and they planned to close the high school on Friday out of an abundance of caution.

Chitwood said the 14-year-old was taken into custody on Wednesday night and charged with making terroristic threats and harassment by communication. Police say no weapons were found at the teen’s home.

School officials say Upper Darby High was found to be safe and classes will now resume on Friday.