Toblerone products on display at a tasting event | Neilson Barnard/Getty Images for NYCWFF EU probes maker of Toblerone and Milka for anticompetitive behavior The Commission has concerns that Mondelēz may have restricted cross-border sales in single market.

Brussels has opened an antitrust probe against snack company Mondelēz for restricting trade across the EU.

The U.S. food giant, which produces the Milka and Toblerone chocolate brands, declared on Friday that it is under EU investigation in its statutory annual report. "In November 2019, the European Commission informed us that it has initiated an investigation," the document reads.

The investigation covers potential anticompetitive agreements and possible abuse of dominant position.

"The Commission has concerns that Mondelēz may have restricted cross border sales of its products in the EU’s single market," a spokesperson for the Commission said.

There is no official timeline to the case, according to the EU official.

The Mondelēz probe is Brussels' latest push to crack down on unfair territorial restraints in the European Union over the last years.

In January, it fined NBCUniversal €14.3 million for imposing illegal restrictions on territory, language and customer groups for products featuring the Minions or “Jurassic World.” It also slapped shoemaker Nike with a €12.5 million fine in March 2019, and Hello Kitty producer Sanrio with a €6.2 million fine in July 2019 respectively for engaging in similar practices.

In May 2019, Brussels fined Belgian-Brazilian beer giant AB InBev €200 million for restricting beer sales from the Netherlands into Belgium.