Museum of Fine Arts Bern giving up pieces it concludes were stolen by the Nazis or of doubtful origin, but retaining most despite their provenance remaining unproven

Culture minister says German authorities working to 'fulfill our moral responsibility' by determining the provenance of pieces found in Cornelius Gurlitt's collection

Three pieces recovered in Gurlitt trove given to descendants of Armand Dorville, most of whose relatives were killed during German occupation of France

Showing works from collection amassed during World War II and discovered in 2012, Israel Museum attempts to untangle history of quarter-Jewish dealer who thrived under the Nazis

Long-awaited exhibit of some 100 works of art from the larger collection of Hildebrand Gurlitt, some of which was looted by Hitler regime, goes on display at the Israel Museum

Paul Signat's 'Quai de Clichy,' found in Gurlitt hoard, returned to family of Gaston Prosper Levy, who fled from Nazis in France

Gurlitt collection, which contains many looted works, 'raised touchy questions,' says curator, who wanted to show how visual art was 'instrumentalized by Nazi Germany'