Los Angeles police swiftly enforced a downtown curfew, making arrests moments after it took effect, while deploying officers on horseback and using crowd control projectiles to break up a group of hundreds demonstrating against President Donald Trump’s immigration crackdown .

Members of the National Guard stood watch behind plastic shields, but did not appear to participate in the arrests Tuesday night .

Hours later, many of the protesters had dispersed, although sporadic confrontations continued that were much smaller than in previous nights. Officials said the curfew was necessary to stop vandalism and theft by agitators looking to cause trouble.

The demonstrations have been mostly concentrated downtown and the curfew covers a 1-square-mile section that includes an area where protests

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