SAN FRANCISCO, June 30 (Xinhua) -- Thousands of demonstrators gathered in front of the San Francisco City Hall on Saturday to speak out their strong opposition to U.S. President Donald Trump's "family separation" immigration policy.

The protesters, braving the scorching hot, marched in an endless row of crowd from downtown Market Street in San Francisco to City Hall for the Families Belong Together Rally, a nationwide rally of mass resistance against Trump's immigration policies.

They held posters with the messages "Families Belong together" "No One Is Illegal" and "Stop Torturing Children" and chanted slogans to express their rejection to the government's "inhuman" measures against immigrant families seeking asylum at the U.S.-Mexican border.

"We take to the streets to call for an end to the human rights abuses by ICE officials and Trump's policy that cruelly separates children from their families," one of the marchers said, referring to the Immigration and Customs Enforcement (ICE).

Organizers of the event included Families Belong Together San Francisco, Women's March San Francisco and Indivisible SF.

"We will fight for our immigrant neighbors. We will fight for the children being ripped away from their families. We will do everything in our power to defend basic human values," tweeted Scott Wiener, who also attended the rally at the City Hall.

"San Francisco stands with immigrant families!" he wrote in the Twitter post.

In San Jose, an economic, cultural, and political center of Silicon Valley and the largest city in Northern California, thousands of people came together at City Hall and marched along the city to protest the separation of immigrant families.

The marchers, old and young, men and women, clapped their hands and chanted slogans "Vote him out! and "Si se puede! Yes we can!"

They filled the sidewalks of the city to oppose the administration's actions in separating immigrant families.

More than 20 similar rallies took place across the Bay Area, with some of the biggest ones in San Francisco, Oakland and San Jose.

They went out in a mass mobilization to protest Trump's "zero tolerance" policy that has led to the separation of more than 2,000 migrant children taken away from their parents in weeks of massive crackdown on illegal immigration.