PLAQUEMINE - Administrators closed Plaquemine High School for the day Tuesday after the superintendent said someone phoned in a threat to the school.

Iberville Schools Superintendent Ed Cancienne's office said students were sent home and buses turned around after arriving at the school out of an abundance of caution. Students were evacuated to the Plaquemine Civic Center before getting dismissed for the day.

Sheriff Brett Stassi said they are investigating, and the FBI is assisting them.

"I called the feds this morning and brought them in," Major Ronnie Hebert with the Iberville Parish Sheriff's Office said. "They will be working in conjunction with our technology people in trying to locate the person responsible by trying to find the phone that was used. We are doing cell phone tower dumps to locate the person or that phone."

Investigators said the person who phoned in the threat took steps to avoid detection.

"They'll take a phone and take the sim card out," Herbert said. "That phone is still able to dial 911. It's a good feature for people who need 911, but for people who want to do it as a hoax or prank it hurts us in law enforcement because it makes it almost impossible to track that phone."

Cancienne said the school system was still trying to determine if students would have to make up the time that was missed. Stassi said they are "losing a day of summer" because of the person who made the threat.

Stassi said anyone with information about the threat can contact the sheriff's office at (225) 687-5100. Tips can be made anonymously, and could be eligible for a $1,000 reward.