Sinéad O’Connor reported missing in Chicago since Sunday morning

The Irish singer has been struggling with custody battles over her sons in recent months

UPDATE: Sinead O’Connor has been found alive and well in Chicago. Read more here.

Sinéad O’Connor has been reported missing in the Chicago area, after she did not return from an early-morning bike ride on Sunday.

Police in the suburb of Wilmette released a statement on Monday, saying they were searching for the Irish singer, and confirming that they had issued a check for well-being, because she hasn’t been heard from since she left where she was staying to go for the ride at 6am.

“A caller has expressed concern for her well-being,” police told CBS in Chicago, but no additional information was provided.

O’Connor, who is most famous for her rendition of Prince’s song “Nothing Compares 2 U”, has apparently been staying with friends in Wilmette, a conurbation which is about 15 miles north of Chicago.

The singer has undergone several highly publicised struggles in recent times. In November, she wrote a post on Facebook threatening suicide, and she is embroiled in a long-running battle for custody of her children.

One of the final Facebook messages she posted before her disappearance seemed to address her eldest son, Jake Reynolds, making reference to legal proceedings.

She wrote: “Jake, kindly go to the court on Tuesday and take custody your brother from Tusla. My lawyer will be making the illegal way yourself and Donal got him into Tusla (lying to the cops etc) known to the judge.

“Expect to be in trouble. In fact you’d best bring a lawyer of your own. And do not abandon your brother or any other of my babies again. What you have done to your brother and your mother is LITERALLY criminal.”

Earlier this month, the comedian Arsenio Hall was reported to be suing her for £5m in damages, following unsubstantiated comments she made alleging he had supplied drugs to the late Prince, who died on 21 April. The cause of his death is still unclear, but certain press reports have implicated prescription drugs in his death.