Art gracing the walls of the German parliament could be the result of Nazi-looting, reports allege.

German papers reported this week that two paintings in particular could have come from the collection of Fritz Gurlitt, uncle of Hildebrand Gurlitt, a now-deceased art collector at the center of a billion dollar Nazi-looted art scandal.

The paintings in question are a 1905 oil painting by Georg Waltenberg, “Chancellor Bulow speaks in the Reichstag,” and a 1918 Lovis Corinth lithograph, “A Street in Konigsberg.”

The German government has said it is looking into the matter. However, the parliament’s art advisory council has already said the pieces are not in fact the plunder of Nazi looters.

Some 4,000 pieces hang in Germany’s parliament building, but only an estimated 700 were acquired prior to the end of World War II, raising speculation over the nature of the works’ history.

Dieter Graumann, head of the Central Council of Jews in Germany, told the Bild newspaper that the government should make public the records of the pieces and assist investigators in connecting heirs with long-lost property.