Sinead O’Connor is missing after she failed to return from a bike ride on Sunday.
On Monday, Chicago police put out a missing persons report for O’Connor. She was last seen around 6 a.m. when she went on a bike ride in Wilmette, USA Today reports.
An anonymous caller reportedly notified police that they were worried about her well-being after she never came back.
Authorities said they are searching a Chicago suburb for her.
A report noted that she had posted a strange message on her Facebook account several hours after she was last seen.
Last fall, cops responded to calls about O’Connor after she wrote that she had “taken an overdose” at a hotel in Ireland. She was reported safe and received medical assistance. (RELATED: Sinead O’Connor Blasts Family After Suicide Attempt: ‘You’re Dead To Me’)