Iowa school shooter appeared to be active on Discord and discussed ‘gearing up’ in moments before attack

The Iowa gunman who opened fire on Perry High School last week appeared to have an active account on the internet chat platform Discord where he previously discussed school shootings and described “gearing up” moments before Thursday’s attack, NBC News has learned.

Dylan Butler, 17, killed sixth grader Ahmir Jolliff, 11, and injured four other students and three staff members, including principal Dan Marburger, before he died of a self-inflicted gunshot wound. Police said they also found an improvised explosive device at the scene.

Law enforcement is reviewing Butler’s use of social media and tech platforms, including Discord, according to a person close to the investigation.