The National Guard has at times detained protesters in its deployment to Los Angeles, an official said Wednesday, as demonstrations against Immigration and Customs enforcement raids spread to other major cities.

In 1970, four students were killed when National Guard troops opened fire on anti-war protestors at Kent State University.

Tensions flared in Los Angeles late Monday. On Tuesday, teams worked to scrub away, cover up or fade out protesters' graffiti.

HOW WE GOT HERE: The protests erupted after Immigration Customs Enforcement (ICE) officers on Friday carried out raids in three locations across L.A., where dozens of people were taken into custody. Newsom called the raids “chaotic federal sweeps” that aimed to fill an “arbitrary arrest quota.”

Trump’s border czar says he’s sending National Guard to fight LA anti-ICE protests as clashes continue into second day - Tense confrontations between police and demonstrators in L.A. continued for a second day on Saturday,