A teenager was arrested Thursday on suspicion he was planning a shooting at a Cape Cod school, authorities said.

The 18-year-old, Ian Fotheringham, was found with a 3D printer that can produce a firearm, and had images of the deadly Columbine High School shooting on his phone, the Cape & Islands District Attorney's Office said Friday. A search of his Falmouth home in August — prompted by a tip that he wanted to enact a school shooting — had found no illegal guns.

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Fotheringham faced a charge of threatened use of a deadly weapon in a public building in Barnstable District Court on Friday and was ordered held until a dangerousness hearing Tuesday, prosecutors said. It wasn't immediately clear if Fotheringham had an at

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