POLICE report for ‘robbery by snatching’ filed but no criminal charges pressed yetAuthorities said to be keeping an eye on BrownIf probation revoked could face up to four year in jailChris 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. 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