Police in the U.S. city of Chicago say Irish singer and musician Sinead O'Connor has been found safe, and is no longer considered a missing person.
Police in the Chicago suburb of Wilmette had said earlier Monday that they were seeking to "check the well-being" of the singer, who went for a bike ride Sunday but had not returned after more than a day. They said they had received a call from someone expressing concern about O'Connor.
Representatives for O'Connor had no immediate comment.
O'Connor, 49, soared to fame in 1990 when she released the international hit "Nothing Compares 2 U," a cover of a Prince ballad. The song topped the charts around the world and earned her multiple Grammy Award nominations.
However, the singer is as much known for her music as for her shaved head and blunt-spoken manner, including criticisms of the Catholic Church. In 1992, O'Connor ripped up a picture of Pope John Paul II on the late-night comedy show Saturday Night Live.
Earlier this month, O'Connor made headlines when she accused comedian Arsenio Hall in a Facebook post of giving drugs to iconic U.S. pop singer Prince, who died last month. Hall is suing her for $5 million for defamation.
In November, O'Connor posted a message on Facebook saying she had taken an overdose while visiting Ireland and received medical treatment.
O'Connor has often spoken about her mental health problems, including a diagnosis of bipolar disorder.
Hundreds of people posted on O'Connor's Facebook page Sunday and Monday expressing concern about her disappearance and asking O'Connor to call police. Other commentators wondered whether her disappearance was a publicity stunt.
In her most recent post, O'Connor appeared to be asking her son to go to court this week to take custody of his brother.