June 11 (UPI) -- The second night of curfew took place in downtown Los Angeles on Wednesday, as local law enforcement, backed by several thousand members of the National Guard, attempted to restrain violent protests and prevent vandalism.

Meanwhile, a group of protesters were in a standoff with law enforcement officers outside a federal courthouse in Santa Ana, about 32 miles south of Los Angeles, in Orange County. Military-style vehicles and National Guards troops blocked a portion of a street in front of the Ronald Reagan Federal Building and Courthouse and in front of a federal building a couple blocks away.

And protests also are occurring in other major U.S. cities,, including New York, Chicago and Washington, D.C.

The downtown Los Angeles curfew will remain in effect between 8 a.m. and 6 a.m., according to the Los Angeles Police Department's Central Division. Ramps onto and off the 101 freeway also will continue to be closed, police said.

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