Gunfire broke out Monday night while law enforcement authorities were on an apparent surveillance operation in the unincorporated Walnut Park neighborhood adjacent to South Los Angeles.
The operation was being conducted by authorities from San Bernardino County when shots were reported in the 2900 block of Flower Street, according to the Los Angeles County Sheriff's Department, which patrols the neighborhood.
Department black-and-white patrol cars flooded the area after the gunfire broke out, according to KTLA-TV Channel 5 news footage.
A Sheriff's Department spokesman said it was not immediately clear what San Bernardino law enforcement was doing in Sheriff's Department territory. It was also unclear whether officers fired their weapons or were fired upon.
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