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.

Lawrence-Douglas County Fire official Shaun Coffey said Thursday the fire caused an estimated $150,000 in damage. Flames were contained to the third floor but lower floors had smoke and water damage.

The Lawrence Journal-World reports fraternity members said a bathroom and bedrooms sustained the most damage.

The 74 residents of the home were allowed to return to the house Tuesday evening.

Coffey said he did not know what type of smoking materials caused the fire.

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(Information from: Lawrence Journal-World)