Police and paramedics respond to Pittsburgh Central Catholic High School for what turned out to be a hoax report of an active shooter on Wednesday in the Oakland neighborhood of Pittsburgh. Gene J. Puskar/Associated Press

SEATTLE  — U.S. authorities on Thursday said they arrested a Washington state man who made more than 20 “swatting” calls around the country and in Canada, prompting real emergency responses to his fake reports of bombs, shootings, or other threats.

Ashton Connor Garcia, 20, of Bremerton used voice-over-internet technology to conceal his identity as he placed the calls last year – and he treated them as entertainment, broadcasting them on the social media platform Discord, federal prosecutors said.

He faces 10 felony counts filed in U.S. District Court in Tacoma, Washington, that could bring up to a decade in prison.

“Every time Mr. Garcia is alleged to have made one of his false reports to law enforcement, he triggered a potentially deadly event – sending heavily armed police officers to an address where they mistakenly believed they would confront someone armed and dangerous,” Seattle U.S. Attorney Nick Brown said in a news release. “Fortunately, no one was hurt, but the unpredictable and terrifying dynamic these calls created for Mr. Garcia’s alleged victims cannot be overstated.”

Garcia’s arrest came as a spate of threats and false reports of shooters have been pouring into schools and colleges across the country, unnerving officials, parents, and students who are already on edge about actual school shootings – including at a private Christian school in Nashville, Tennessee, this week.

Computer-generated calls on Wednesday made hoax claims about active shooters in Pennsylvania, and a day earlier, nearly 30 Massachusetts schools received fake threats.

Garcia is not accused of having sent SWAT teams to schools. Instead, prosecutors say, in several cases, he collected personal information about his victims and threatened to send emergency responses to their homes unless they turned over money, credit card information, or sexually explicit images.

Law enforcement entered some of the homes with guns drawn and detained people inside, authorities said.

In other cases, he called in fake bomb scares for the Fox News station in Cleveland, Ohio, on July 28 and for a flight from Honolulu to Los Angeles on Aug. 23. In another instance, he is accused of threatening to bomb an airport in Los Angeles unless he received $200,000 in Bitcoin.

The indictment does not indicate how investigators identified Garcia as a suspect.

Garcia placed the calls to agencies in California, Georgia, Illinois, Kentucky, Michigan, Minnesota, New Jersey, Oho, Pennsylvania, Tennessee, Washington, and Edmonton, in Alberta, Canada, the indictment said.

Authorities have warned that such hoaxes can prove deadly. In 2017, a police officer in Wichita, Kansas, shot and killed a man while responding to a hoax emergency call. This month, the city agreed to pay $5 million to settle a lawsuit, with the money going to the two children of 28-year-old Andrew Finch.