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By Corky Siemaszko

Irish singer Sinead O'Connor was found safe Monday a day after she vanished while on a bike ride in the posh Chicago suburb of Wilmette.

O'Connor "is no longer considered a missing person," police said in a statement.

They did not say where the 49-year-old singer was found or where she had been.

Sinead O'Connor during a performance in 2014.Flavio Lo Scalzo/AGF/SIPA / Sipa via AP Images File

O'Connor has been staying in Wilmette, a wealthy North Shore suburb, with a friend since January, a source told NBC News.

The drama began around 6 a.m. (7 a.m. ET) Sunday when O'Connor was reported missing by a caller who "expressed concern for her well-being," Wilmette police said.

Concern grew as police searched for O'Connor. Singer Josh Groban tweeted his hope that she would soon be found.

"The demons she battles are no joke," he wrote a couple hours before O'Connor was located.

Read more at NBC Chicago

Best known for her cover of the Prince song "Nothing Compares 2 U," O'Connor was in the news earlier this month after Arsenio Hall sued her for defamation.

Hall sued after O'Connor claimed the former late-night talk show host plied Prince with drugs over decades.

O'Connor has been treated for mental health issues. On Nov. 29, she gave her fans a scare after posting an apparent suicide threat on Facebook in which she claimed to have taken an overdose of some substance because of a "horrifying set of betrayals."

"There is only so much any woman can be expected to bear," the post read, according to Billboard and other publications. "I've taken an overdose. There is no other way to get respect."

Lindsay Good and Alex Johnson contributed.