FRANKFURT, Germany (AP) – The German auto industry’s troubles over excessive diesel emissions are looming larger.

Shares in the three biggest German automakers fell Monday after a newsmagazine report claimed they had colluded for years over diesel technology.

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BMW was off 2.3 percent, Daimler 3.4 percent and Volkswagen 2.5 percent. Shares also fell Friday after Der Spiegel published its findings online.

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Spiegel reported that company employees from Volkswagen, Audi, BMW, Mercedes and Porsche had met often since the 1990s and had agreed to limit the size of the tanks holding a urea solution used to reduce diesel emissions.

BMW issued a statement denying that its urea tanks were too small to provide adequate exhaust treatment and said its vehicles’ emissions met legal requirements.

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