Up to 5,000 of the 26,000 chickens are believed to have died for lack of air.
Graffiti left on the wall of the farm contained the letters EVR, the Finnish abbreviation of the Animal Liberation Front.
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Thousands of Chickens Die after Attack on Poultry Farm
Suspected radical animal welfare activists raided a poultry farm in Närpiö in the southwest of Finland Thursday night. The raiders broke eggs, and destroyed electric equipment, causing the ventilation system to break down.
