FBI arrests man who allegedly pledged allegiance to ISIS and planned attacks on Idaho churches, DOJ says

Alexander Scott Mercurio, 18, was charged with attempting to provide material support or resources to a designated foreign terrorist organization, according to a Justice Department news release. The FBI’s Joint Terrorism Task Force conducted the investigation.

Mercurio planned to attack churches in Coeur d’Alene, Idaho, on Sunday “using weapons, including knives, firearms, and fire,” according to court documents cited by the Justice Department.

Investigators believe Mercurio’s alleged efforts to carry out an attack intensified following the March attack that killed 144 people at a concert hall complex near Moscow, according to a US law enforcement official. Russian and US authorities have blamed an ISIS group for that attack.

“As alleged in the complaint, the defendant swore an oath of loyalty to ISIS and planned to wage an attack in its name on churches in Coeur d’Alene, Idaho,” Attorney General Merrick Garland said in the release.

“Thanks to the investigative efforts of the FBI, the defendant was taken into custody before he could act, and he is now charged with attempting to support ISIS’s mission of terror and violence,” he added.

Mercurio faces a maximum penalty of 20 years in federal prison if convicted, according to the Justice Department. He is currently in custody awaiting his initial court appearance.

CNN could not immediately identify an attorney for Mercurio.

“This case should be an eye-opener to the dangers of self-radicalization, which is a real threat to our communities,” said Special Agent in Charge Shohini Sinha of the Salt Lake City FBI.

CNN’s Evan Perez and Hannah Rabinowitz contributed to this report.

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