Singer Chris Brown allegedly attacked a man during a basketball game in Las Vegas.

The crooner, who was in the city for the Floyd Mayweather Jr. versus Manny Pacquiao boxing bout, has been accused of becoming involved in a brawl at the Palms Casino Resort, reports tmz.com.

Brown was playing with a group of men at 3:42 a.m. on Monday when an argument broke out with one of them and the "Loyal" hitmaker is alleged to have thrown a punch.

Police officials were subsequently called to the scene, but did not speak to Brown.

Later, they are reported to have offered the singer two options: allow the district attorney to decide what charges to press or sign a citation for misdemeanour battery and face the charge in court.