BOISE, Idaho (AP) — Residents along U.S. Highway 95 in west-central Idaho including those living in the town of Riggins have been told to be ready to evacuate Wednesday due to a wildfire that's on the move.

Fire managers say the size of the fire grew to 29 square miles — a 5-square-mile increase from Tuesday — with extreme fire behavior that included sustained runs through tree crowns and long-range spotting.

Officials say winds up to 20 mph and hot conditions will make firefighting difficult Wednesday.

A group of fires in northern Idaho near Kamiah remained at 74 square miles as crews work to strengthen lines against the blazes that have destroyed 42 homes.

Sixteen large fires are burning in Idaho, the National Interagency Fire Center says.

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