The Federal Bureau of Investigation and the Arizona Attorney General’s Office have arrested an 18-year-old Tucson man they say conspired to carry out acts of terrorism against government buildings in Maricopa and Pima counties.

Mahin Khan was arrested in Tucson following an investigation by the FBI’s Joint Terrorism Task Force, according to the FBI. He was booked into Maricopa County jail on suspicion of conspiring to commit terrorism.

Attorney General’s Office spokeswoman Mia Garcia and FBI officials said Khan’s alleged plans did not involve the Fourth of July or any related festivities.