The heirs of a Jewish collector say a painting from a Texas museum on loan in Germany was stolen from their family by the Nazis, and have filed a complaint asking for its return, a German newspaper reported Wednesday.

German daily Bild reported the unidentified heirs are claiming ownership of Henri-Edmond Cross’ “Regatta in Venice” from 1903/04, which is currently on show at the Barberini Museum in Potsdam, near Berlin. The painting is on loan from the Museum of Fine Arts in Houston, Texas.

The painting originally belonged to Jewish-French collector Gaston Levy, but was confiscated by the Nazis in 1940, said Christoph Partsch, a lawyer for the family.

“My clients found out only now about the existence of this long-missing painting and they demand its return,” Partsch told The Associated Press.

The lawyer said the family lives in Europe, but didn’t want to further identify them.

The Potsdam state court has given the Barberini Museum a deadline of next week to respond to their demand, Partsch said.

The court had no immediate comment, but the Barberini Museum confirmed the court’s involvement and said it was in touch with the Houston museum. It said both “see the clarification of the legitimate owner as an urgent obligation.”

After the war, the painting surfaced in the United States where in 1958 it was donated to the Houston museum, the Barberini museum said.

“The question of provenance is especially important because Cross is an artist whose work has been forgotten in Germany due to confiscations by the Nazis from German collections as well,” the museum said in a statement.

The impressionist work is painted with oil on canvas in the pointillism style and shows several gondolas on the water and the city line of Venice in the background.

The Museum of Fine Arts in Houston did not immediately respond to an emailed request for comment.

(AP)