CARBONDALE, Ill. (AP) – A Southern Illinois man has pleaded guilty to claiming in a letter that he’d planted a bomb at a school and to sending threatening letters to government officials. The (Carbondale) Southern Illinoisan reports that Jonathan Bohn entered his plea last week and was sentenced to a year and one day in prison. Bohn sent the letters prison in 2014 when he was serving a sentence for bank robbery. The letters to the clerk about the bomb in a Franklin County school prompted officials to temporarily close nine schools in the area.