Japanese carmaker Mitsubishi is being probed by German prosecutors for suspected installation of illegal emissions-management software on some diesel-powered vehicles, as the chief prosecutor said in Frankfurt on Tuesday.

"Ten commercial properties which belong to the automobile manufacturer group and two supplier groups" are being searched through, said Chief Prosecutor, Noah Kruger.

The affected vehicles are those with "four-cylinder 1.6- and 2.2-liter diesel engines […] and the emission classes are Euro 5 and Euro 6," he added.

The Japanese auto company confirmed that its German sales office as well as the research and development locations had been searched.

The automotive supplier Continental confirmed that it was being witnessed in the proceedings and had also been searched.

Mitsubishi is the latest manufacturer to be investigated over suspicion of hiding illegal levels of pollution, after a regulatory clampdown on toxic fumes triggered by Volkswagen's admission in 2015 that it had cheated emissions tests.

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