Reports : Thousands works of art found in raid by Nazis tax authorities . Paintings by Klee , Augsburg , Chagall , Klee believed to have been looted by German . Experts call for works to be returned to the families of those they were stolen from .
Reports : 1,500 works of art found in raid by German tax authorities . Paintings by Picasso , Matisse , Chagall , Klee believed to have been looted by Nazis . Experts call for works to be returned to the families of those they were stolen from .