One person was hurt during an explosion at a cheese plant Friday morning. It happened at Knaus Cheese, which is located on County Highway C in Lamartine. The Lamartine Fire Chief tells our Green Bay affiliate that one person was airlifted to a hospital with burns and broken bones. That person is said to be in stable condition. The chief says a spark caught a barrel on fire and that caused the explosion. The explosion sparked a small fire. The chief says the fire didn't cause extensive damage. Crews were called to the scene at about 7:30 a.m.