SAN FRANCISCO — Two right-wing rallies planned for the weekend in the San Francisco Bay Area were canceled Friday, with organizers citing threats from left-wing agitators, but local officials said they remained concerned about the potential for violence.

A Saturday “freedom rally” planned near the Golden Gate Bridge in San Francisco was canceled by the group Patriot Prayer, which said it would hold a news conference at a city park instead.

Patriot Prayer leader Joey Gibson said his followers would instead attend an anti-Marxist rally in nearby Berkeley on Sunday, but a short time later the organizer of that rally called it off. “I am asking that no one come to my event,” Andrea Cummings said in a statement issued via Facebook. She said she had “grave concerns for the safety of the people attending my event.”

Cummings said her rally was “to speak out against the political violence happening to people who do not agree” with left-wing ideology, and that the meaning was being lost as rhetoric around the rally escalated. However, she said she “alone” would still show up Sunday.

Mistrust remained high on both sides.

San Francisco Supervisor Mark Farrell said he believed Patriot Prayer members were still likely to rally at Crissy Field despite the official cancellation.

“This is all hands on deck for the city of San Francisco no matter what happens tomorrow,” Farrell said.

He urged left-wing counter-protesters not to show up there, encouraging them to instead to attend a city-organized anti-hate gathering at the Civic Center.

“People in San Francisco are looking for an outlet,” Farrell said. “They have been looking for a place to go. What we’ve tried to do is hold an event away from everything, as much possible.”

Tension over the gatherings had built in the two weeks since violence erupted at a white supremacist rally in Charlottesville, Va. James Alex Fields Jr., 20, was charged with murder after driving a car into a crowd of counter-protesters, killing a 32-year-old woman.

Gibson and Cummings insisted their gatherings would be peaceful, but critics alleged they would be magnets for racists and people who would seek violence.

A number of counter protests were planned.

The left-wing group By Any Means Necessary, which has been involved in violent confrontations, vowed to shut down the Berkeley rally.

Many groups in the city synonymous with the “Summer of Love” had planned to welcome their political opponents with unusual weekend protests, though it wasn’t clear which of those would continue.