After a week of protests over federal immigration raids, about 200 Marines moved into Los Angeles on Friday to guard a federal building and personnel in the city.

Homeland Security Secretary Kristi Noem is promising to move forward with the Trump administration’s immigration crackdown in Los Angeles despite the waves of unrest.

About 500 of the National Guard troops deployed to the Los Angeles protests have been trained to accompany agents on immigration operations, the commander in charge said Wednesday.

The Los Angeles Police Department has made nearly 400 arrests and detentions since Saturday in connection to immigration protests.

Dozens of mayors from across the Los Angeles region banded together to demand that the Trump administration stop the stepped-up immigration raids that have spread fear across their cities and sparked protests across the U.S. They also called on President Donald Trump to pull back from using troops alongside immigration agents during the raids.