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Authorities are investigating the cause of a massive fire at an egg farm in Southeastern Wisconsin.

The fire broke out at S&R Egg Farm in LaGrange Friday night.

It took almost 15 hours for firefighters to put it out.

The company says one of its 14 barns was destroyed. Roughly 300,000 chickens were inside.

No people were injured.

The farm produces up to 2 million eggs a year.