Other / Not Specified, Other Business Sprinklers keep fire from spreading at vacant building (Cincinnati, OH) June 25, 2014 viking210 A fire began around midnight Wednesday morning near an air conditioning unit on the fifth floor of a vacant building. 76 firefighters responded to the fire, and these responders, in addition to the sprinkler system were able to control the fire. No injuries were reported, and the fire’s cause is undetermined.