Sinead O’Connor was reported missing after she went on a bike ride in north suburban Wilmette.
The singer left on a bicycle around 6 a.m. on Sunday and did not return, Wilmette police said.
“A caller has expressed concern for her well-being,” police said.
No additional information was provided by police.
The Irish singer-songwriter is perhaps best known for her recording of Prince’s song “Nothing Compares 2 U” and her appearance on “Saturday Night Live” when she tore a photo of Pope John Paul II during a live performance.
Follow this developing story on CBS Chicago.