Here is an official response from the Department of Homeland Security on the bomb threats targeted to numerous HBCUs: Addressing Bomb Threats at Historically Black Colleges and Universities 

This article discusses an update of behind the threats made towards HBCUs and what this could mean for the future of safety procedures on these campuses: “Given the federal limitations for charging under-age perpetrators with federal crimes, the Department of Justice worked with state prosecutors to hold them accountable on charges unrelated to the specific threats to the HBCUs,” according to the FBI. “This individual is under restrictions and monitoring of his online activities.”