Officials say a wildfire that burned hundreds of square miles of rural land in Oklahoma and Kansas this week destroyed at least 41 structures in both states.

Oklahoma Forestry Services spokeswoman Hannah Anderson says authorities in both states determined 16 residential structures and 25 minor structures were destroyed in the blaze.

Officials have yet to determine the cause of the fire, which started last week in Woods County in northwest Oklahoma and spread into Kansas. The fire was mostly contained Wednesday, with crews monitoring for hot spots.

Agricultural officials are estimating the damage. The Oklahoma Forestry Service says about 600 head of cattle died. The Kansas Department of Agriculture says no cattle death estimates are immediately available.