Sinead O'Connor has been found safe and well after going missing for more than 24 hours, police said.

The Nothing Compares 2 U singer had not been seen since 6am on Sunday when she went for a bicycle ride in Chicago.

Officers in the area said they were checking on the 49-year-old's well-being as they believed she may be suicidal.

The Irish pop star appeared to put a series of posts on her official Facebook page yesterday.

Her cover photo was also updated to one of anti-slavery activist Harriet Tubman and a quote which said: "I had reasoned this out in my mind, there was one of two things I had a right to, liberty or death; If I could not have one, I would have the other."

In November last year O'Connor posted on the social network that she had taken an overdose.

At the time a representative for her was reported as saying she was "unwell and receiving treatment".

Earlier this month, American comedian Arsenio Hall filed a $5m (£3.5m) libel lawsuit against O'Connor after she accused him of furnishing Prince with drugs.

It states O'Connor, who scored a hit in 1990 with her rendition of Prince's Nothing Compares 2 U, barely knew the superstar and called her accusations "fabricated lies".