Two Columbia County middle school pupils were arrested this week and charged with writing threatening messages on restroom walls.

A seventh-grade pupil at Greenbrier Middle School was arrested today, said Columbia County sheriff’s Capt. Steve Morris.

The 12-year-old boy, whose name was not released, wrote “bomb” on a wall in the boys' restroom at about noon and was charged with terroristic threats and disrupting pubic school, said Capt. Morris.

No device was found at the school, and pupils were not evacuated, he said.

The boy appeared before juvenile court for a detention hearing today and was then booked at the Columbia County Detention Center, where he will be released to his parents, Capt. Morris said.

On Tuesday a Lakeside Middle School pupil told the principal that he saw another pupil writing a threat on the wall of a restroom, according to a Columbia County Sheriff’s Office incident report. The pupil was charged with criminal trespass and released to his parents, according to the report.