Social media posts described a "small blast", the use of tear gas and pepper spray, fireworks being lit, and a man covering his eyes as blood covered his hands and dripped down his face. Ten people were arrested in that protest.
Police arrested more than a dozen people and requested aid from other law enforcement agencies.
CHICAGO Thousands of chanting, sign-carrying protesters took to the streets in cities across the nation Saturday, demanding that President Donald Trump release his tax returns, so Americans can scrutinize his business ties and potential conflicts of interest.
A melee erupted on Saturday, in a Berkeley, California park where supporters and opponents of President Donald Trump were holding competing rallies, resulting in at least 20 arrests, as police struggled to keep the two camps apart.
Police had erected a light, neon-orange plastic barricade at the park between the two sides to separate the groups and were collecting sticks, flagpoles and other objects that protesters had brought, which were banned at the park in advance of the protest.
But Stephanie Edd, also of Berkeley, viewed the protest as an attempt "to co-opt the history of free speech". In confusion, anti-Trump protesters fled as supporters of the president charged after them, attacking stragglers. Opposing groups quickly organised their own event. "Rain or shine or fascism we will be here", said a young woman operating the cash register. One person was stabbed, police said.
Last month, 10 people were arrested and seven others injured at what was supposed to be a pro-Trump rally in the famously liberal community.
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"I don't mind hitting" the counter-demonstrators, whom he called "neo-Nazis", Rhodes said.
But 71-year-old Ilene Singh said he's wrong.
"These Trump people are here because they want to start things", Jeff Vernon of Berkeley said. City officials had shut down a farmers market in the park in anticipation of Saturday's rally, and warned against vandalism and violence.
The marches coincided with the traditional April 15 deadline for United States federal tax returns, though the filing date was pushed back two days this year.
Protesters in Raleigh, North Carolina, said they suspect that Trump's returns might show he has paid little or nothing to the government he now heads, or that he was indebted to Russian, Chinese or other foreign interests.
"Until he does, we'll never know what he's hiding or who his policies are created to benefit", said organizers of the "Tax March" demonstrations on its website.