JERSEY CITY - The teenager who shot himself outside a Jersey City elementary school Tuesday was at the time with another student who previously threatened to shoot a school security guard, sources with knowledge of the investigation said. 

The 14-year-old who accidentally shot himself attended classes at School 15 on Stegman Street Tuesday and left when the school day ended. He returned to the school with a gunshot wound a short time after dismissal, officials said.

While the school district said it has not been determined if the 14-year-old had the weapon inside the building during the school day, multiple sources said authorities believe the gun was inside the building.

On Wednesday, the district announced metal detectors would be installed at the K-8 school.

A source close to the investigation, who is not authorized to speak publicly on the matter, said the student who was not injured in the shooting had recently threatened to shoot a security guard who works in the building. The student has not been charged because authorities have not recovered a weapon, the source said.  

The source added that an internal incident report was generated after the security guard was threatened.  

District spokeswoman Maryann Dickar directed further questions about the investigation to the Jersey City Police Department. City spokeswoman Jennifer Morrill said the shooting remains under investigation.

Dickar additionally declined to discuss if any security guards' jobs were affected, citing policy to not discuss personnel matters. Asked if any incident reports had been filed over the alleged threats to a security guard, Dickar said such document is part of a student's record and there "is an open police investigation."

In a statement, the school district said the gun used "appears to be someone else's" although it's unclear to whom the gun belonged.

The teenager was charged with unlawful possession of a handgun, possession of a weapon for unlawful purposes and possession of a firearm by a minor. He was released from the hospital and remanded to the Union County juvenile detention center. 

Caitlin Mota may be reached at cmota@jjournal.com. Follow her on Twitter @caitlin_mota. Find The Jersey Journal on Facebook.

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