In Boardman, Ohio, the FBI says an 18-year-old man who frequently praised mass shootings online had 10 pistols, more than a dozen rifles and some 10,000 rounds of ammunition when agents raided his home last week. Justin Olsen was arrested after he wrote online he would “shoot every federal agent in sight.” The FBI says Olsen also praised the 1995 Oklahoma City bombing and discussed violence against Planned Parenthood clinics. Olsen’s arrest came just days after mass shootings in Dayton, Ohio, and El Paso, Texas, left 32 people dead.