BERLIN — German officials say they have identified a sixth work from the art trove accumulated by the late collector Cornelius Gurlitt as having been looted by the Nazis.

The German Lost Art Foundation said Wednesday researchers determined that the “Portrait of a Seated Young Woman” by Thomas Couture belonged to Georges Mandel, a Jewish French politician who was murdered in 1944.

Authorities stumbled on Gurlitt’s collection while investigating a tax case in 2012. The reclusive collector inherited works from his father, Hildebrand Gurlitt, an art dealer who traded in works confiscated by the Nazis.

The German government-backed foundation and the Swiss museum to which Gurlitt bequeathed his collection are working to ensure that any pieces looted by the Nazis before making their way into Gurlitt’s trove are returned to owners’ heirs.

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