Cumberland County units dispatched shortly after 1900 hours to 811 Spangler Road at ADM Milling Co. for a reported building fire. PD reported an explosion and fire shooting from the roof. Companies arrived to a multi-story grain, mill facility with fire in the grain elevators on multiple floors. Command 14 ordered a second alarm followed by a third alarm bringing in companies from York and Dauphin Counties. Harrisburg Tower 3 was assigned RIT on the second alarm. Firefighters were hampered when the sprinkler system failed requiring hose stretches to be made up several floors. Extensive overhaul had to be performed to ensure no hot spots were still smoldering. One firefighter suffered minor injuries and all employees were able to make it out safely. Companies remained on the scene for several hours.