Firefighters in Idaho are making slow progress toward containing two large complexes of wildfires under difficult conditions.

Authorities say the Pony Complex of fires southeast of Boise was somewhat less active Sunday due to a heavy smoke inversion. The fire has burned about 187 square miles and is now 20 percent contained.

Flames consumed two cabins and an outbuilding in Syrup Creek, but other homes are being protected. At least 200 homes are under evacuation orders in the small Elmore County town of Mayfield.

The nearby Elk Complex of fires is now estimated at 125 square miles and 5 percent containment.

Firefighters reported Sunday they believe some structures in the area of Falls Creek had been damaged.

The Sheriff's Department was asking some residents in the Pine area to evacuate.