The altercation took place around 2:45 a.m. local time on the 400 block of N La Cienega Boulevard, the Los Angeles Police Department said.
Bieber was hosting an after-party at The Nice Guy restaurant and lounge, following a concert, and “the shooting occurred … near The Nice Guy, but it was not directly in front,” a source familiar with the event told CNN.
The source added the musician had already left the party when the shooting took place.
Police said “multiple rounds were fired” after the fight, striking three men, 19, 24, and 60 years old. All three victims were eventually transported to hospitals and are in stable condition, police said.
“The incident is not gang-related,” police added.
CNN reached out to Bieber’s publicist Saturday, but has not heard back.
The Nice Guy restaurant is owned by The h.wood Group, a hospitality company that owns several venues in the Los Angeles area. CNN could not reach a representative for h.wood.