UPDATE: After roughly 90 minutes of tension, KAIT-TV in Jonesboro reported shortly before 3 p.m. that an armed man that put the Arkansas State University campus in lockdown had been taken into custody. There have no reports of shots fired. A bomb squad will check the man's truck, which police surrounded shortly after he drove onto the center of campus and was seen holding what appeared to be a shotgun. The sheriff said no shots were fired and no one was hurt.

This is what we reported earlier:

The official Arkansas State University Twitter account at 1:35 p.m. posted this message:

Report of an active shooter spotted at the student union. Everyone should evacuate to the west side of the building and clear the area.