PONTIAC -- Pontiac Township High School was locked down and searched by police for about two hours Thursday as a precaution after what appeared to be prank emergency calls over the school's radio system.
School officials heard about 10:55 a.m. a male voice say over the radio: "Code Red. This is not a drill." Principal Jon Kilgore tried to verify who was making the transmission but got no response.
Kilgore was suspicious it might not have been real, "but we've got to play it safe," he said. They called 911 and followed lockdown procedures.
Pontiac Police Chief Dale Newsome said police searched the building, but found no problems.
Kilgore called an all-school assembly to let students know what happened to correct any misinformation.
"Everything went off without a hitch," Newsome said. "The response was exactly as we have practiced."
The school changed the emergency code word, but then there was another "Code Red" call about 12:30 p.m. Kilgore knew it was a false call and told the caller over the radio he could be prosecuted.
Newsome said the high school and elementary school districts will inventory their radios to see if one is missing, and police will continue to investigate.
Officers involved were from the Pontiac, Dwight and Fairbury city departments, the Livingston County sheriff's Department and state police.
A little over a year ago, on Dec. 14, 2010, the school got a bomb threat that caused an automatic evacuation. The man responsible was sentenced to eight years in prison.