The incident occurred close to the German provincial town Gemünd.
The environmental authority has communicated that the respective mobile unit had been put in charge of the investigation.
Officials visited the location on Thursday to get a picture of the situation and launch the inquiry. No further details are known at this stage.
The region, especially on the German side, has an ongoing struggle with unlawful waste disposal. For years, a private property in Gemünd's town centre has accumulated masses of scrap metal.
