(CNN)Some are teenagers accused of threatening to gun down classmates. Others allegedly issued social media warnings of attacks on store customers or coworkers. Still others are said to have vowed to unleash small arsenals against victims based on their race or religion.
More than two dozen people have been arrested over threats to commit mass shootings in the weeks since 31 people were killed in one August weekend in shootings in El Paso, Texas, and Dayton, Ohio,
The raft of cases follows a directive by the FBI director immediately after those two massacres for agency offices nationwide to conduct a new threat assessment in an effort to thwart more mass attacks.