A 10-year-old boy and his mother suffered graze wounds when a bullet struck the bus they were riding on in South Los Angeles, police said.
The incident was reported at 6:40 p.m. at 42nd Street and Avalon Boulevard.
The boy was treated for a neck wound. His mother was hit in the face with glass and debris.
The wounds were not life-threatening, police said.
It started when two men got in an argument that escalated into gunfire, said LAPD Detective Tommy Thompson.
Up to five rounds were fired.
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Detectives, armed with flashlights, collected bullet casings in front of the businesses along Avalon Boulevard.
