Multiple Historically Black Colleges and Universities, or HBCUs, say they received serious threats on Thursday, a day after right-wing influencer Charlie Kirk was shot dead on a college campus in Utah.

The schools that received threats, in addition to some HBCU campuses acting out of an abundance of caution, have ceased campus activity in some way.

Alabama State University, located in Montgomery, said it had received “a terroristic threat” directed at the campus and had shut down facilities for the remainder of the day, including classes, rehearsals and any other scheduled events. The school has police clearing all buildings on campus.

Hampton, Virginia’s Hampton University also announced it had “received notice of a potential threat” and canceled all campus activities for both Thursday and Friday. The university encouraged all students who live on campus to “minimize their movement” in the area and asked that everyone remain “vigilant” and report any suspicious activity.

Virginia State University, located in Ettrick, said it’s gone into lockdown “out of an abundance of caution” after receiving a threat, too.