Los Angeles police said another group that was staying at the Mariposa Hotel in block 12800 of Riverside Drive was visited by another group around 7:30 a.m.
An argument took place and escalated into shooting. Someone from the visiting group was killed outside an elevator.
At least one person from the visiting party knew the group staying at the hotel, but additional details about the cause of the dispute are unclear.
The victim has not been identified.
Whitney Rosales, who was visiting from the Bay Area, was getting off the elevator when she saw blood splattering on the floor.
No arrests were made. The police did not reveal whether a weapon had been found.
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