ST. LOUIS (AP) — 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 group in St. Louis at the IRS office building downtown joined the nationwide demonstrations.

Violent clashes were the exception during the largely peaceful demonstrations, but in Berkeley, California, police arrested 13 people and confiscated knives and makeshift weapons after fistfights broke out between factions that support and oppose Trump.

Trump was the first major-party nominee in more than 40 years not to release his tax returns, saying it was because he was under audit. He later said that voters don’t care.

But 71-year-old Ilene Singh said he’s wrong. She rode a bus from New Jersey to New York City with her friend Geraldine Markowitz, 83, to take part in protests. “We’re here to say we care,” said Singh.