An 18-year-old high school senior was arraigned in court Thursday on charges of making terrorist threats on Facebook, among them a boast  he’d outdo the carnage of the Boston Marathon bombings.

A judge ordered Cameron B. Dambrosio of Methuen, a suburb 30 miles north of Boston, held without bail. He was arrested Wednesday afternoon.

Dressed in a black t-shirt, gray sweatpants and blue sneakers, the schackled Dambrosio did not speak at his brief court appearance. A probable cause hearing will be held on the charges May 9.

Fellow students at Methuen High School reported Dambrosio had posted “alarming” comments on his Facebook page, including this one: “(Expletive) the Boston bombing, wait til you see what I do. I’m going to be famous.”

Three people were killed and more than 270 injured, many gravely,  when two homemade bombs exploded near the finish line of the marathon on April 15. The tragedy put Boston on edge for several days, until one suspect was killed in a police shootout and another suspect captured.

Police Chief Joseph Solomon said Dambrosio, who was arrested a year ago on an unrelated assault charge,  communicated a general terrorist threat, a crime that could land him in prison for 20 years.

“We have zero tolerance,” said Solomon. “We take these very seriously.”

Police searched Dambrosio’s home Wednesday, turning a computer and Xbox over to state police for analysis. They were also combing through his Facebook postings.

Solomon said Dambrosio’s said on Facebook he would “kill somebody” and would “go insane and make the news.” The chief said another posting said “people shouldn’t cry when they see what he does because they have it coming.”

Solomon also quoted a posting as saying “he’s going to beat every murder charge brought against him.”

School Superintendent Judity Scannell said Dambrosio’s threats were not made against fellow students or the school, but included “disturbing verbiage” aimed at general violence.

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Details for this story were provided by The Eagle-Tribune, North Andover, Mass.