The military has activated about 700 active-duty Marines who could be sent to Los Angeles, joining National Guard troops who were sent to the city to respond to protests, U.S. Northern Command said in a statement.

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.