Some 700 U.S. Marines are headed to Los Angeles, as protests targeting the Immigration and Customs Enforcement agency stretch into a fourth day.The move comes amid heightened tensions between California leaders,

The last time the National Guard was activated without a governor’s permission was in 1965, when President Lyndon B. Johnson sent troops to protect a civil rights march in Alabama.

A relative state of calm in Los Angeles began to crumble early Sunday afternoon as demonstrators confronted federal authorities guarding a downtown detention facility where chaos erupted as National Guard soldiers deployed tear gas on an increasingly agitated crowd.