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An 18-year-old Tucsonan was arrested Friday, accused of plotting "acts of terror" against government buildings in Pima and Maricopa counties, authorities said. The FBI and Arizona Attorney General's Office investigated Mahin Khan, who was being held without bond.

Khan was charged with one count of conspiracy to commit terrorism and one count of terrorism, authorities said. He appeared before a judge Saturday, but records in the case were sealed. He was arrested in Tucson, but was being held at the Maricopa County Jail.

Officials said that despite the timing of the arrest, Khan's alleged plans were not related to the July 4 holiday.

Additional details about the allegations were not immediately available.

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