Chris Brown has been accused of angrily snatching a girl's iPhone outside a nightclub in Miami and driving off with it. A 24-year-old woman filed a police report on Sunday for 'robbery by snatching', a spokesman for the Miami Beach Police Department told TMZ. Christal Spann claimed she followed Brown and rapper Tyga out of a nightclub early in the morning and took a photograph of the singer getting into his Bentley. Christal told police that Brown 'flipped out when he saw her camera phone' according to the website told her: 'B****, you're not going to put that on the Internet'. According to the police report, Chris then rolled up his window and drove off with the iPhone in his hand. The police representative added that no arrests have been made and no warrant has been issued yet and the investigation is continuing. Browns representatives are yet to comment on the matter. TMZ also reports the LA District Attorney's Office is now keeping a close eye on Brown and is waiting to see what action, if any, the L.A. County Probation Department is taking. Brown is still on probation for beating his then girlfriend Rihanna in 2009 and any criminal charges could result in his probation being revoked and the singer being sent to prison for up to four years. Meanwhile, RadarOnline reports today that Brown is telling friends he has done nothing wrong. An insider told the website: 'Chris is hopeful that the evidence and the true facts of the case will result in no charges being made against him. 'Chris is letting his lawyer, Mark Geragos, deal with the Florida State's Attorney's Office.' The source added: 'He will do whatever his attorney asks him to do. He is no longer in Miami, but if he needs to return for any reason, he certainly will. Chris has nothing to hide.' Meanwhile, Brown has endured another Twitter backlash after writer and comic Kevin Seccia offered $1,000 for the first person to 'beat up the singer.' In a blog post, Seccia writes that Brown is 'a horrible human being,' before going on to argue that the R&B singer 'does not even pretend to be sorry' for having 'brutally assaulted and threatened to kill a woman' - referring to Brown's assault on Rihanna in 2009. He says that he will pay the $1000 prize to 'the first person to deliver proof that they hit Brown with 'at least two solid punches.' The latest Twitter backlash against Brown comes after country singer Miranda Lambert spoke out against the star after he bagged two Grammy awards.