An armed man drove onto Arkansas State University on Thursday, sparking a campus lockdown before police took him into custody without any shots fired, a university spokesman said, reports the Associated Press .

University spokesman Bill Smith said the man was taken into custody about an hour after the incident began. The campus remained on lockdown as police inspected the man’s truck, he said.

The school sent an alert early Thursday afternoon urging the evacuation of the student union following a report of an active shooter. A later tweet said there were no shots fired or any reports of injuries.

Jonesboro police spokesman Paul Holmes said a negotiator was sent to the scene to speak with the man. It wasn’t clear what, if any, discussions took place.