With just three days of school left, a bomb threat scrawled on a boys bathroom wall forced an evacuation Wednesday morning at Chestatee Academy of Inquiry and Talent Development.

The message said they “intended to blow up the building,” Hall County school system Superintendent Will Schofield said. “We of course take any kind of threat like that seriously.”

After a sweep by the Hall County Sheriff’s Office and two bomb-sniffing dogs, no evidence of a bomb was found, according to Gordon Higgins, school system spokesman.

Sheriff’s office investigators are working to identify a suspect, and a $1,000 reward has been offered by the school system for information leading to an arrest and conviction.

“The sheriff’s department has pledged cooperation in prosecuting to the full extent of the law, because this is something we just do not want to tolerate — disruption of a school day like this,” Higgins said.

A student first saw the message and told a nearby custodian, who then informed the front office about 9:30 a.m., Higgins said.

The sheriff’s office responded by 10 a.m., Higgins said. The students were taken to the nearby Chestatee High School’s stadium, and parents were notified. The driveway to the school was packed with vehicles as word of the incident spread.