A Northwest Indiana teacher was placed on leave after he wrote a threatening message on the chalkboard last week during class, the schools superintendent said.



Lake Station Schools Supt. Dan DeHaven confirmed an Edison Junior-Senior High School teacher wrote a message that read: A) You are idiots!!!!!!!! B) The guns are loaded!!! C) Care to try me ?????????"



Students snapped a photo of the message during first period Friday and posted it on Facebook, DeHaven said. The school resource officer saw the photo on Facebook, and the teacher was sent home by 10:30 a.m. that day.



DeHaven told NBC Chicago there is no imminent danger and an investigation is underway. He met with local police Monday and said the situation was being taken very seriously.



"In today's world, you cannot make those references," he said.



DeHaven said the teacher is a business instructor who has worked at the school for about 27 or 28 years. He said he does not know why the teacher would write such a message and said no instance like this has ever been reported before at the school.



A phone message was sent to parents Monday letting them know their kids are safe and an investigation is underway.



Parents told NBC Chicago they wonder why the message wasn't sent sooner and said they hope serious action is taken against the teacher.



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