Police on horseback dispersed crowds in L.A. before the curfew came into effect at 8 p.m. local time on Wednesday evening. (The curfew lifts at 6 a.m.) An estimated 400 arrests and detentions have taken place so far amid the ongoing protests in the southern Californian city.

Following four days of escalating protests that defaced landmarks and damaged property in downtown L.A., Mayor Karen Bass imposed a regional curfew on Tuesday in an effort to restore order.

Protests over immigration raids have broken out in several other cities, including Chicago, New York, San Antonio and Spokane, Washington.

The ‘quiet zone,’ a 1-square-mile section of downtown, seemed to be yielding positive results, with less chaos and property damage overnight Wednesday.

The curfew took effect at 8 p.m. Pacific time and applies until 6 a.m., covering a roughly 1-square-mile area between the 5 Freeway, 110 Freeway and 10 Freeway. Authorities have warned that the curfew could be in place for several days.

L.A. Opera lets patrons exchange tickets, MOCA and the Broad curtail hours, Center Theatre Groups tabulates revenue losses from cancellations. How L.A. arts groups have been affected by the downtown curfew.

Coordinated "No Kings" protests are underway from coast-to-coast, part of a "national day of peaceful protest" against the Trump administration that is expected to draw millions. Protesters in some areas braved wet weather to raise signs and chant slogans supporting the rights of immigrants and criticizing what they see as Trump's power grab.