An Idaho teenager who was allegedly planning an attack on churches in the name of Isis has been arrested. Last Saturday, federal authorities arrested 18-year-old Alexander Scott Mercurio of Coeur d’Alene, Idaho, a day before his alleged planned attack on churches in the city using weapons including knives, firearms and fire. The federal investigation into Mercurio began when he allegedly reached out to confidential human sources online and indicated his support for Isis, according to a criminal complaint. Unbeknownst to him, Mercurio detailed his support to an FBI informant. In addition to spreading Isis propaganda online, Mercurio allegedly solicited the...