Despite having declared her war of words with Miley Cyrus over, Sinead O'Connor has penned a fourth open letter to the pop star, criticizing her for making light of mental illness and urging her to apologize for her actions. It's not a matter of settling a petty celebrity feud, O'Connor says, but rather helping afflicted young people seek the treatment they need.

"In your country suicide is the second highest cause of death amongst 25-34 yr olds," O'Connor writes on her website. "A lot of these deaths would not take place if it were not the case that stigmatisation and bullying and buffooning of those perceived mistakenly or otherwise to have mental health issues, especially when they seek help, creates silence and causes many not to seek help."

Elsewhere in her 1,700-word missive, O'Connor claims Cyrus fans have contacted her since the feud began last week and suggested she commit suicide.

"Luckily I am a strong person," O'Connor writes. "And I have four children whose lives would be destroyed if I were to buckle under the abuse you set me up for.. If I were not, and or I did not have four children, these types of communications and these types of articles and remarks could have had their desired effect."

O'Connor's spat with Cyrus began when the controversial Irish songstress warned the young singer in her first open letter about the industry's attempts to make her a "prostitute." The Queen of Twerk responded by tweeting comparisons to Sinead and Amanda Bynes, another celebrity who's spoken candidly about her struggles with bipolar disorder.

"I’m not ‘feuding’ or fighting with you," O'Connor insits. "But I am asking that you restore dignity to myself and Amanda and all sufferers. in doing so you will restore dignity on this matter to yourself. To leave people you have hurt so badly with no apology is unacceptable."

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