Updated

Police at Western Kentucky University say they have released five students held for questioning after unconfirmed reports of gunfire forced a campus lockdown.

Students were urged to seek shelter and the school was locked down for several hours Wednesday after students phoned 911 to report that they'd seen men with guns and heard shots.

Officials later said there were at least two fights on the campus about an hour north of Nashville, Tenn., but no indication that shots had been fired.

Five men were held for questioning, but officials said Thursday that they were released after no guns were found. The men denied being involved in the fight and no charges were filed.

Students got text messages alerting them to the situation after the shots were reported.