It is reported that 'X Factor' singer Wagner Fiuza-Carrilho has been involved in a new stand-off with another contestant on the ITV show.
The Mirror alleges that the 54-year-old and 16-year-old One Direction singer Harry Styles had to be pulled apart after some horseplay turned serious.
The paper alleges that Fiuza-Carrilho said: "Don't mess with a man who knows martial arts."
A source told The Mirror: "Trouble flared towards the end of a video session, when tensions were already running high.
"Wagner, One Direction, Nicolo Festa, Storm Lee and John Adeleye had all sung a line together and immediately after it, Harry was told to jokingly rugby tackle Wagner as he walked out of shot.
"Unfortunately no one had told Wagner what was in store.
"The next thing he knew, Harry was play fighting him to the ground and Wagner didn't realise the camera was still rolling.
"Incensed, he shook Harry off and squared up to him, locking foreheads.
"He looked pretty scary as he snarled at Harry, warning him he was a karate expert.
"He then made as if to do an elaborate karate chopping movement, and shoved Harry, before staff stepped in and separated them.
"It was all pretty hostile and the atmosphere afterwards was terrible."
Fiuza-Carrilho was said to be remorseful after the alleged incident, with bosses demanding he apologise to cast and crew.
Another source told the paper: "Wagner was just being playful. He feels like a 15-year-old boy himself and sometimes forgets that he's not. He's just a big softie at heart."