WARSAW, Poland (AP) — Polish prosecutors have opened an investigation into a Swedish artist's claim that he used the ashes of Holocaust victims to make a painting.

The artist, Carl Michael Hausswolf, wrote on the website of a gallery in Lund, Sweden, last year that he made a painting using ashes that he took from crematorium furnaces in Majdanek, a former Nazi German death camp located in eastern Poland, on a visit there in 1989.