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Sinéad O’Connor is missing and authorities believe she might be suicidal.

The “Nothing Compares 2 U” singer, 48, went for a bike ride in the Chicago suburb of Willmette early Sunday afternoon and hasn’t been seen since, reports TMZ.

O’Connor was last seen on a motorized bike with a pink basket dressed in a black parka, black leather bands and an Ireland sweatshirt, according to the website. She was reportedly classified as “missing suicidal” in the alert released by police.

In November, the singer revealed that she had “taken an overdose” in a disturbing message posted to her official Facebook account.

A request for comment from O’Connor’s representatives was not immediately returned.