Azealia Banks has blasted Sia as a "pompous white b****".
The controversial rapper was furious when the Cheap Thrills singer slammed her for sharing footage of a blood covered closet which she claimed to use for sacrificing chickens for witchcraft.
Sia tweeted: "Sacrificing animals for your gain is the wackest s**t I've ever heard. Get ahead by being awesome, kind and working hard (sic)."
However, Azealia posted Sia's tweet on Instagram and wrote: "And your ugly pasty dry white lady winter skin face is the ugliest face I've ever seen that must be why you hide it all the time.
"Have some f****** respect for my f****** traditional African religion you pompous white b****".
She then declared: "this is your first warning".
However, the posts have since been removed and replaced with one message which read: "Stop apologising. No more explanations (sic)."
She then added a picture of herself and captioned it:
"Witch-witch-Witch-witch-Witch-witch-Witch-witch-Witch-witch-Witch-witch-Witch-witch-Witch-witch" - it has also been deleted since.
Sia took to Twitter after Azealia shared videos of herself cleaning out the bloodstained closet on her Instagram story.
Warning: This clip contains explicit language and footage which may be upsetting for some.
Azealia said: "The amount of crap that's about to come off my floor right now, guys, oh my god. Three years' worth of brujería. Yes, you know, I gotta scrape all this s**t up.
"Real witches do real things. Blood stains the wall (sic)."