The Jonesboro Sun, the local newspaper, tweeted information from the police chief that the armed man was "armed with shotgun" and had "two propane tanks ready to blow."
Report of an active shooter spotted at the student union. Everyone should evacuate to the west side of the building and clear the area.
— Arkansas State (@ArkansasState) December 10, 2015
The university issued an alert at 1:36 p.m. and asked campus to shelter in place.
University spokesman Bill Smith told the Associated Press a negotiator was dispatched to the scene to talk with the suspect, but it was unclear what discussions took place.
"Our tactical people are getting themselves in a position to respond as well," Holmes told AP.
A student tweeted a photo of the scene:
— Jama Lynn Domerese (@TheBadMammaJama) December 10, 2015
The school is located in Jonesboro, Arkansas, about 130 miles northeast of Little Rock.
This post has been updated.