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Howard University in Washington, D.C. is among the HBCU schools receiving bomb threats on the first day of Black History Month Tuesday.

The school issued emergency alerts and shelter-in-place directives to students and faculty about the campus-wide lockdown on Tuesday.

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More than a dozen other HBCUs received bomb threats on Tuesday morning, the start of Black History Month.

Bethune-Cookman University, Southern University, Albany State University, Bowie State University and Delaware State University also received bomb threats.

“We don’t know who’s behind this, but we do know it’s motivated by hate,” Howard University President Wayne Frederick said Tuesday. “We’ve had these challenges before but definitely since I’ve been here [as a student] in 1988, it has not been this widespread and also, I think, this overt.”

The list of historically Black schools receiving bomb threats in recent weeks include Morgan State University in Maryland, Coppin State University in Maryland, Fort Valley State University in Georgia, Kentucky State University, Xavier University of Louisiana, Edward Waters University in Florida, Alcorn State University and Mississippi Valley State University, Rust College in MS, Spelman College in Atlanta, Jackson State University, and Tougaloo College in MS, among others.

The FBI have investigated and no bombs were found on any of the HBCU campuses.

So far, there are no suspects.