Thousands of Bay Area residents gathered outside of San Francisco’s City Hall to take part in the 14th annual Walk for Life rally.
The nation-wide event is run by the Walk for Life Organization with the purpose to send a vocal and visual message protesting abortion and to stand up for the lives of unborn children and their families.
Carrying a banner that read "abortion hurts women," a large crowd of demonstrators made their way down Market Street.
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"I love women. I know the pain that abortion causes," participant Sarah Williams said.
Organizers of the Walk for Life found it difficult to tell how many people came out but they estimate 50,000 people showed up including counter demonstrators.
The event began with a Roman Catholic Mass and a rally at the Civic Center Plaza where speakers called abortion evil and harmful to women, AP reports.
The march comes a week after President Trump addressed anti-abortion activists at a Washington, D.C. march.
Protesters usually gather every Jan. 22, on the anniversary of Roe v. Wade, the U.S. Supreme Court decision that legalized abortion.
Associated Press contributed to this report.