The European Commission on Thursday made unannounced inspections at several telecommunications companies over concern they may have violated EU anti-trust rules.

The companies involved were not identified by the Commission, but Reuters reported that Deutsche Telekom (ETR:DTE)  and Orange SA (ETR:FTE1) were two of the three targeted.

"The Commission has concerns that the companies … may have violated EU anti-trust rules that prohibit the abuse of a dominant market position," the EU executive said in a statement.

The unannounced inspections are preliminary, the statement said and that carrying them out does not mean the firms are guilty of “anti-competitive behavior.”