Nobody was injured when a grain bin ruptured early Friday morning in the small town of Green Mountain. The Green Mountain fire chief said crews were called to the scene just before 5:30 a.m. He said one of the original grain bins ruptured because of a containment failure. No one was on site when it happened, but the rupture did impact a nearby office building. » Download the free KCCI app to get updates on the go: Apple | Google PlayGet the latest headlines from KCCI