Prosecutors on Thursday dropped a case against a Falmouth teenager who’d been charged with allegedly threatening to shoot up a school, according to authorities and legal filings.

Cape and Islands District Attorney Robert J. Galibois ’s office dropped a sole count of threatening to use a deadly weapon in a public building that had been pending against Ian Fotheringham , 18, officials said.

“As the investigation unfolded, the Cape and Islands District Attorney’s Office and the Falmouth Police Department learned of a discrepancy which made further prosecution in the District Court no longer available, and the Commonwealth” dropped the charge, said a statement issued by Galibois’s office.

“This matter remains an ongoing investigation and future developments will be released when publ

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