Justin Bieber's visit to a New York club reportedly ended in a bloody brawl on Saturday night (August 3).
The "Beauty and a Beat" singer allegedly "went nuts" on a fellow reveller as he partied at Southampton hotspot South Pointe, leading to a physical altercation between members of the star's entourage and club patrons.
The fight is thought to have been triggered by a heated exchange between Justin, 19, and a male club-goer after a female friend attempted to hit on the singer in his roped-off V.I.P. section.
A source told the New York Daily News: "He ripped his shirt off and went nuts. He was screaming."
Justin's security team quickly intervened and took the star out to the club's parking lot to cool off, but things took a turn for the worse inside the nightclub.
The singer's friends and members of his security were "involved in a fight" after he was escorted out, and an eyewitness reported seeing blood.
Earlier in the evening, the "Boyfriend" hitmaker's bodyguards were accused of being "heavy-handed" with fans who had hoped to meet the star.
Justin arrived with his entourage and four bodyguards at around 2 a.m. and quickly "took over" the V.I.P. area, which was closely guarded by his eagle-eyed minders.
The security team were described as being "intimidating" and "overbearing," and even flashed a torch in the face of partygoers who tried to snap pictures of Justin on their cameraphones.