The unlawful assembly was declared for the area of 5th and Hill streets at Pershing Square just before 7:30 p.m. as LAPD quickly shut down the small protest.
LAPD described the crowd as "large and unruly," and ordered individuals to leave immediately. The motive behind the protest was unknown.
A large police presence descended on the area as a few dozen protesters gathered, with some blocking an intersection. But by 8 p.m., few protesters were still at the scene.
No arrests were made.
At least two unlawful assemblies were declared Tuesday night in downtown L.A. as police arrested dozens on suspicion of failing to disperse.
As counting from the presidential election continues in key battleground states, LAPD on Wednesday again declared a citywide tactical alert to be prepared for possible unrest. Shortly before 9:40 p.m., the department canceled the tactical alert.
Many businesses in the L.A. area, particularly in downtown, Hollywood and Beverly Hills boarded up their storefronts earlier in the week in anticipation of violence and vandalism associated with protests.