Apartment Building, Residential Sprinklers contain fire in apartment with mentally and physically challenged residents (Knoxville, TN) October 7, 2014 viking210 The Knoxville Fire Department says the blaze started around 2 a.m. at the Parkridge Harbor Apartments. When crews arrived, smoke was found coming from a burning mattress in a common area laundry room on the second floor of the building. According to officials, an automatic sprinkler had activated, keeping the fire at a minimum.