Tensions in Los Angeles escalated Sunday as thousands of protesters took to the streets in response to President Donald Trump's extraordinary deployment of the National Guard, blocking off a major freeway and setting autonomous vehicles on fire as local law enforcement used tear gas, rubber bullets, and flash bangs to control the crowd. Some police patrolled the streets on horseback while others with riot gear lined up behind Guard troops deployed to protect federal facilities including a detention center where some immigrants were taken in recent days.