No cause found yet for Wis. chemical plant fire
MADISON, Wis. (AP) — The investigation into a chemical fire in Columbus is winding down.
The fire broke out at Columbus Chemical Industries on May 11. A series of explosions forced firefighters to retreat and evacuate about 140 homes.
Dodge County Sheriff Todd Nehls says Friday investigators have interviewed about 60 people, including company workers, the first firefighters to arrive and people who drove by. He says investigators have spoken to everyone they wanted but no cause has emerged.
Investigators said last week they found no evidence of foul play.
State Department of Natural Resources spokesman Greg Matthews says the agency got the results of area groundwater tests Thursday. They showed no harmful levels of contaminants in private wells.

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