Intel offices in Munich were raided by the European Commission on Tuesday as part of an ongoing anti-trust investigation.

Confirming the raids, Intel spokesman Chuck Mulloy said the company fully co-operated with the EC. He declined further comment.

The Commission inspected the premises of CPU manufacturers and PC retailers, said Jonathan Todd, spokesman for the EC, declining to comment on which companies were raided.

The offices of German consumer electronics vendor Media Markt and DSG International, which runs Dixons in the UK, were also raided, according to multiple newspaper and wire service reports.

The raids relate to concerns of the abuse of a dominant market position, the EC said in a statement.

"Surprise inspections are a preliminary step in investigations into suspected infringements of EC competition law," the Commission said. The inspections do not prove guilt of anti-competitive behaviour or prejudge the outcome of the investigation, the Commission said.

The raid comes on the heels of multiple complaints and lawsuits filed by Intel competitor AMD with authorities in the European Union, US, Japan, South Korea and Japan, charging Intel with monopolistic behaviour.

In 2006, AMD said it planned to file a complaint with German authorities regarding Intel's alleged anti-competitive actions. AMD alleged that Intel paid German retail chain Media Markt not to stock PCs containing AMD processors, citing a letter to a supplier in which the retailer said it would only buy PCs with Intel processors.

As part of ongoing inquiries into Intel's monopolistic behaviour, the EC earlier raided Intel's offices in 2005. Authorities in Japan raided Intel's offices in 2004.