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Fire investigators in La Crosse have yet to determine whether a blaze Saturday that destroyed the regional office of Democratic advocacy group We Are Wisconsin just 10 days before recall elections was intentionally set.

"It's still under investigation," La Crosse Fire Chief Mark Amann said Sunday. "It'll be (Monday) or the next day before they have a determination."

No one was seriously injured in the blaze, which started around 9:30 a.m. Saturday and lasted several hours. About half a dozen firefighters suffered heat exhaustion and had to get IV treatment, Amann said.

The fire destroyed a warehouse at 118 Fifth Ave. and also affected a small apartment building at 423 Jay St. that housed Optical Fashion and the headquarters of We Are Wisconsin. The warehouse was demolished after the fire.

The fire came only 10 days before the recall election between Republican Sen. Dan Kapanke and Democratic challenger Rep. Jennifer Shilling. Campaign workers at Shilling's office at 116 5th Ave. - which shares a wall with the destroyed building - had to evacuate the building.

We Are Wisconsin has spent more than $1 million in the recall elections.