The Stuttgart public prosecutor’s office searched the premises of Daimler AG at several locations in Germany, in connection with “preliminary investigations of known and unknown employees of Daimler AG due to suspicion of fraud and criminal advertising relating to the possible manipulation of exhaust-gas aftertreatment in passenger cars with diesel engines.”

The company, which owns Mercedes-Benz, has stated it is “fully cooperating with the authorities,” but are unable to provide further comments on the ongoing preliminary investigations. According to Reuters, the search involved 11 different sites across Germany, with 23 prosecutors and around 230 staff, including police and state criminal authorities.

Ever since the dieselgate scandal, carmakers have had to face increased scrutiny by regulators over their emissions tests. Organisations have also opted to implement new real-world testing methods, which is claimed to offer more probably results.