Mick Thomson of US heavy metal band Slipknot has sustained a serious head injury after allegedly being stabbed by his brother.
The 41-year-old guitarist was rushed to hospital with a wound to the back of his skull after what appears to be a drunken fight at his home in Clive, Iowa.
Clive Police Chief Michael Venema told the New York Daily News: "Neither individual was very cooperative. Our detectives will be following up as soon as their medical situation allows us."
The band's lead singer Corey Taylor took to Twitter after the news broke to address the aggressive incident, saying: "In regards to the story about Mick, I'm doing the best I can to find out if he's alright. I'll get back to you later."
He later reassured fans that Mick was "okay" and that he will pass on everyone's concern.
He wrote: "Mick Update: from what I've heard he's okay. We're sending him all your thoughts. Thank you for that. (sic)."
Mick Update: from what I've heard he's okay. We're sendig him all your thoughts. Thank you for that.— 'Mad Beans' Hooper (@CoreyTaylorRock) March 11, 2015
Police believe Mick and his brother Andrew were both drunk during the incident, which initially started inside the house and ended up outside.
Andrew was also taken to hospital with injuries but the pair arrived in separate ambulances.
Meanwhile, the group - also consisting of Jim Root, Craig Jones, Sid Wilson, Shawn Crahan and Chris Fehn - are scheduled to resume their tour next month but it is not yet known how Mick's injuries will affect the show.