A student was charged Thursday with terroristic threat for allegedly posting signs around Stephen F. Austin State University that warned of a deadly mass shooting.

Sophomore Jennifer Grant was arrested Wednesday and released Thursday after posting $7,500 bond, said Officer Katie Sanders of the Nacogdoches County Jail.

Grant, 20, lives in an off-campus apartment complex where many of the signs appeared April 16. They warned that 10 people at the complex would be shot to death.

Authorities said threatening signs were also found on the campus in Nacogdoches, which is 150 miles southeast of Dallas.

Grant confessed to posting the signs, according to an arrest affidavit issued by university police and obtained by Lufkin television station KTRE.

Police said it was too early to determine a motive. The affidavit said Grant had been given three extensions on a presentation that was due in a class that morning.

An access gate log at apartments indicated Grant entered twice between 2 a.m. and 4 a.m. the morning the signs were found, the affidavit said. Three of the signs were posted around a building where Grant takes six classes, the affidavit said.

Sanders said there was no attorney information for Grant. A telephone listing for her couldn't be found.