A probe by the European Commission into possible manipulation of oil prices has just gotten bigger. Neste Oil Oyj, Finland’s only refiner, has also been asked to help with the investigation. Earlier this week, EU officials raided the offices of three of Europe’s biggest oil companies — BP, Shell and Statoil — and the oil price reporting company Platts, part of McGraw Hill Financial. So far, only Statoil has responded to the allegations, saying it has done nothing illegal.

From London, Marketplace’s Stephen Beard has the latest on the story.