LAWRENCE, Kan. - Investigators say a fire at a University of Kansas fraternity house was caused by improperly disposed of smoking materials. No injuries were reported after the fire Tuesday at the Sigma Chi fraternity house. The fire caused an estimated $150,000 in damage. Flames were contained to the third floor but lower floors had smoke and water damage.. Fraternity members said a bathroom and bedrooms sustained the most damage The 74 residents of the home were allowed to return to the house.