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 self-driving cars on fire as law enforcement used tear gas, rubber bullets, and flash bangs to control the crowd.

Axar.az reports, citing AP, it was the third day of demonstrations against Trump’s immigration crackdown in the region, as the arrival of around 300 federal troops spurred anger and fear among some residents. Sunday’s protests in Los Angeles, a city of 4 million people, were centered in several blocks of downtown.

Democratic Gov. Gavin Newsom requested Trump remove the guard members in a letter Sunday afternoon, calling their deployment a “serious breach of state sovereignty.” He was in Los Angeles meeting with local law enforcement and officials. It wasn’t clear if he’d spoken to Trump since Friday.

Their deployment appeared to be the first time in decades that a state’s national guard was activated without a request from its governor, a significant escalation against those who have sought to hinder the administration’s mass deportation efforts.

The arrival of the National Guard followed two days of protests that began Friday in downtown Los Angeles before spreading on Saturday to Paramount, a heavily Latino city south of the city, and neighboring Compton.

In a directive Saturday, Trump invoked a legal provision allowing him to deploy federal service members when there is ”a rebellion or danger of a rebellion against the authority of the Government of the United States.”

He said he had authorized the deployment of 2,000 members of the National Guard.