Long Beach Police Department units were called to Atlantic Avenue and Artesia Boulevard shortly before 2 a.m. Thursday, said Nancy Pratt, a police department spokeswoman.
Officers found the victim, identified only as a male in his 30s, who said he was driving in the area of Santa Fe Avenue and Wardlow Road when someone in another vehicle pulled up next to his vehicle and opened fire.
Officers went to that location but found no evidence of a shooting, Pratt said.
The victim was taken to a local hospital and treated for a graze wound, she said.
The motive for the attack remains under investigation.
Anyone with information about the incident is urged to call (800) 222-TIPS, text TIPLA plus your tip to CRIMES or go to www.lacrimestoppers.org.