Watch: Iran protests trigger solidarity rallies in US, Europe

Chanting crowds marched in the streets of Berlin, Washington DC and Los Angeles on Saturday in a show of international support for demonstrators facing a violent government crackdown in Iran, sparked by the death of 22-year-old Mahsa Amini in the custody of that country's morality police.

On the U.S. National Mall, thousands of women and men of all ages — donning green, white and red, the colors of the Iran flag — shouted in rhythm. “Be scared. Be scared. We are one in this,” demonstrators yelled, before marching to the White House. “Say her name! Mahsa!” The demonstrations, put together by grassroots organizers from around the United States, drew Iranians from across the Washington D.C. area, with some travelling down from Toronto to join the crowd.

In Los Angeles, home to the biggest population of Iranians outside of Iran, a throng of protesters formed a slow-moving procession along blocks of a closed downtown street. They chanted for the fall of Iran's government and waved hundreds of Iranian flags that turned the horizon into a undulating wave of red, white and green.

“We want freedom,” they thundered.

Shooka Scharm, an attorney who was born in the U.S. after her parents fled the Iranian revolution, was wearing a T-shirt with the slogan “Women, Life, Freedom” in English and Farsi. In Iran “women are like a second-class citizen and they are sick of it,” Scharm said.

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Iran's nationwide antigovernment protest movement first focused on the country's mandatory hijab covering for women following Amiri's death on Sept. 16. The demonstrations there have since transformed into the greatest challenge to the Islamic Republic since the 2009 Green Movement over disputed elections. In Tehran on Saturday, more antigovernment protests took place at several universities.

Iran's security forces have dispersed gatherings in that country with live ammunition and tear gas, killing over 200 people, including teenage girls, according to rights groups.

The Biden administration has said it condemns the brutality and repression against the citizens of Iran and that it will look for ways to impose more sanctions against the Iranian government if the violence continues.

Between chants, protesters in D.C. broke into song, singing traditional Persian music about life and freedom — all written after the revolution in 1979 brought religious fundamentalists to power in Iran.