Miley Cyrus and Sinead O'Connor row escalates

Pop star Miley Cyrus has hit back at Sinead O'Connor,after the Irish singer warned her not to be exploited by the music business.
In a series of tweets,Cyrus mocked O'Connor,comparing her to US actress Amanda Bynes before alluding to O'Connor's mental health problems.O'Connor responded with another open letter to the singer,accusing her of "irresponsible" behaviour.