On January 16 and 17, 2007, European Commission officials, accompanied by members of national competition authorities, carried out unannounced inspections at the premises of several calcium carbide suppliers in Austria, Germany, Slovakia and Slovenia. The companies raided are suspected of violating Article 81 of the EC Treaty. The European Commission has not disclosed the names of the companies concerned, emphasising in a press release that raids are only a preliminary step in the investigation, and that the companies raided are not necessarily involved in anti-competitive practices.