PRATT — The Kansas Office of the State Fire Marshal’s Investigation Division has closed its investigation of the fatal fire on Jan. 25, at 211 Austin, in Pratt. The fire, which resulted in the deaths of five individuals, has been officially classified as undetermined.

Investigators spent three days on scene, interviewing witnesses, examining the scene, sifting debris and examining evidence.

After being unable to eliminate careless smoking or a child playing with a lighter as the cause of the fire, the investigative team classified it as undetermined.