Protesters in San Francisco spent the day blocking the entrance to an unmarked building in the South of Market area. Immigrants had been told to report there in what some believed was a trap by U.S. Immigration and Customs Enforcement to capture people for deportation.

Across the country, an estimated 5 million protesters took part in more than 2,000 protests, according to the American Civil Liberties Union, a co-sponsor of the nationwide protest. In the Bay Area, more than 50 protests were planned stretching south from Gilroy north to Santa Rosa.

Protesters were back at a building in San Francisco's South of Market neighborhood on Sunday, where people who were working on their immigration status received a notice to report in person.

Thousands of people flooded streets across California Saturday as part of a national day of action against President Donald Trump and his administration’s policies. The protests coincided with a military parade in Washington D.C. and President Trump’s 79th birthday.

SAN JOSE — Hundreds of people gathered Monday evening in San Jose, Oakland and San Francisco to protest deportation efforts by U.S. Immigration and Customs Enforcement, as well as to stand in solidarity with protesters in Southern California.

The outburst of public dissent occurred over the weekend after ICE began raids across Los Angeles. ICE said on Saturday that its “operations in LA this week” had resulted in 118 arrests of immigrants in Southern California.

Saturday marks the first full day of Marines on duty in Los Angeles, one week after protests against Immigration and Customs Enforcement raids ignited in LA.

Journalists and advocates say San Francisco police detained multiple reporters and interfered with First Amendment rights during recent protests against immigration raids.