MAPLESVILLE, Ala. (AP) — Officials say fewer than 30 of about 750 students at a rural high school in Alabama showed up for classes after rumors of a potential threat circulated through the community.

Multiple media outlets report the mass absences occurred Monday at Isabella High School in Maplesville, which is about 60 miles (96 kilometers) south of Birmingham.

Chilton County School Superintendent Tommy Glasscock issued a statement saying all absences will be excused.

Sheriff John Shearon says the school system contacted his office Sunday afternoon about a threat supposedly made on a social media app. Shearon says investigators couldn't find any evidence to back up the claims.

Shearon posted extra security at the high school, and he says no other school was affected.