Previously unknown artworks by masters including Marc Chagall, Otto Dix, Max Liebermann and Henri Matisse are among a haul of 1,500 paintings believed to have been confiscated by the Nazis and now found inside a flat in Munich.
The vast trove of modern art seized under Germany's Nazi regime, including works by Picasso, Matisse and Chagall, was discovered in a Munich apartment among stacks of rotting groceries, German magazine Focus reported.
Customs investigators made the find in 2011 after a 76-year-old man travelling by train from Zurich to Munich aroused suspicion at the border when he was found carrying a large, albeit legal, amount of cash.
Focus said Cornelius Gurlitt, a recluse, had funded himself by occasionally selling a painting.
German art historian Meike Hoffmann has been trying to establish the origin and value of around 1,500 artworks found in Munich that were looted by the Nazis in the 1930's and 1940's.
One of the works was reported to be a Matisse painting previously owned by Jewish collector Paul Rosenberg.
His granddaughter Anne Sinclair, the French journalist and ex-wife of the former head of the International Monetary Fund Dominique Strauss Kahn has been campaigning for many years for the return of looted art.