BERLIN, Jan 23 (Reuters) - Germany's motor transport authority KBA has initiated proceedings against BMW over suspicion of manipulating emissions values in its X3 2-litre diesel model, newspaper Bild reported on Tuesday.

The KBA said the case concerns suspicion of use of a defeat device in the engine control of the X3 vehicle, Bild reported, without providing further detail on the case or number of vehicles affected.

A BMW spokesperson declined to comment to Bild on an ongoing case, the newspaper reported.

(Reporting by Victoria Waldersee Editing by Alexandra Hudson)