Madison police will increase foot patrols at Madison Consolidated High School after a second threat on the building in a week.

Chief Dan Thurston said officers will be patrolling the halls at random times throughout the day, and will stay for an undetermined amount of time.

Students were evacuated from the high school at 9:30 a.m. Thursday after police said school officials found a bomb threat written on the wall of a bathroom.

Students were loaded onto buses and taken to Madison Junior High School. Principal Kevin Yancey said the building was cleared in less than 15 minutes.

Members of the Madison Police Department and the Jefferson County Sheriff's Department searched every room and every locker in the school. Students returned to the high school around 11 a.m.

Thurston said police have several suspects in the case through witnesses and video evidence.

At first, Superintendent Ginger Studebaker-Bolinger said the issue was not being considered a bomb threat. She said Thursday afternoon the note mentioned "explosives" and said they will defer to the police department's judgment on whether or not to call the incident a bomb threat.

"It's unfortunate that these things happen," she said. "We certainly want anyone responsible to be discovered and appropriately punished."

Madison police have taken over the investigation.

Police were also called to the school last week in regard to a similar threat written on the bathroom wall. School officials then requested extra police presence for student dismissal.

Thurston said the two incidents are similar because both threats were written on the wall of a bathroom, but he added, "We have no evidence to indicate they are connected."

Anyone with information about the incident can contact Patrolman Seth Melton with the Madison Police Department at (812) 265-3347.