A German environmental group has sued BMW and Daimler for refusing to tighten their carbon-emissions targets and give up fossil fuel cars by 2030, Germany's Handelsblatt newspaper reported.
The group, Deutsche Umwelthilfe, confirmed to Reuters that the lawsuits had been filed on 20 September.
In letters to the automakers in early September, the automakers were given until 20 September to agree to the NGO's demands, which also included limiting production of internal combustion engine cars ahead of 2030.
BMW and Daimler said they had not accepted the NGO's demands.
Neither of the companies has so far set an end date for fossil-fuel vehicle production.