A Perry-Lecompton student was arrested Monday afternoon in connection with a bomb threat scrawled in pencil in the middle school boys’ bathroom.

“It was written on a stall wall – a vague threat,” Superintendent Denis Yoder said. “It was something about a bomb going off at 12 o’clock a.m.”

A student reported the message, written in letters about a quarter-inch high, Yoder said. When school administrators saw the message, they called 911.

Shortly after 11 a.m. Monday, district officials evacuated the high school and middle school students as authorities conducted a canine search.

Officers from the Jefferson County Sheriff’s Office, Shawnee County Sheriff’s Department and Kansas Highway Patrol responded to the school. No bomb was found.

A boy was arrested within 90 minutes of the initial 911 call, according to a release from the Jefferson County Sheriff’s Office.

Students returned to school after the search. The district contacted parents and guardians using a mass communication telephone system two times during the ordeal, both to report the situation and later to report that authorities had deemed the premises safe, Yoder said. He said some parents picked up their children early Monday.

Capt. Randy Carreno of the Jefferson County Sheriff’s Office said Monday afternoon that the suspect was being interviewed.

Reports of the investigation were forwarded to County Attorney Mike Hayes’ office. A woman in Hayes’ office said the county attorney has a policy of not speaking with the media.