Police arrested a 29-year-old man for allegedly assaulting a man in a vehicle stopped at an intersection Saturday morning in Waikiki.

Police said the driver, 29, and another man were seated in the vehicle at a red light on Kalakaua Avenue in front of the Waikiki Shopping Plaza about 1 a.m. when the suspect approached the driver and began yelling at him, apparently for no reason. The man assaulted the driver, causing minor injuries, police said.

A witness and bystanders detained the alleged assailant until police arrived. Officers booked the man on suspicion of unauthorized entry into a vehicle.