Military-style vehicles and National Guard troops have blocked a portion of 4th Street in front of the Ronald Reagan Federal Building and Courthouse.

As anti-deportation protests spread across California Monday, several people were arrested near the Santa Ana Federal Building Monday. It’s not clear how many people were arrested, but some of the protesters were accused of throwing objects at officers and setting off fireworks.

In Los Angeles, hundreds of protesters have now gathered by the federal building in downtown, where dozens of service members are standing guard with shields. Choruses of “Shame on you,” “Traitors” and “Marines out of LA” resound from the street.