Police booked Mynor Antonio Rodriguez, 44, of Los Angeles, on suspicion of felony hit-and-run following his arrest. Rodriguez's bail is set at $50,000.
Police say the pedestrians were struck by an SUV as they crossed Third Street at Boylston Street. Officers arrested Rodriguez at his home.
Anyone who witnessed the crash is urged to call LAPD Central Traffic Division detectives at (213) 972-1840, or (877) LAPD-24-7.
City News Service contributed to this story.