People participate in Women's March in Washington, New York and Seattle on Saturday. [Photo/China Daily]

Huge crowd of demonstrators, many in pink knit hat, marched the streets of Washington on Saturday, a day after Donald Trump's inauguration.

Estimated at half a million by the organizers, marchers from across the country rallied at the National Mall with signs such as "Women rights are human rights”. Then they chanted slogans such as "We are the popular votes" along the Pennsylvania Ave. The march route ended in front of the White House. The purpose of the Women's March on Washington is reportedly to challenge Trump's administration.

People participate in Women's March in Washington, New York and Seattle on Saturday. [Photo/China Daily]

Amy from Baltimore, Maryland, who held a sign "Equal rights for all”, said she is here to stand up for women's rights. She said there's general fear that Trump will continue to favor the elite and take away what Barack Obama was able to give to average working Americans, like healthcare.

Scott Denslow, who comes with his wife from Lousiana, said: "I'm here for women, for equality, for Black Lives Matter, for LGBT rights and for togetherness and unity.”

People participate in Women's March in Washington, New York and Seattle on Saturday. [Photo/China Daily]

Women's March also took place in other cities including New York and Seattle. In New York, tens of thousands of demonstrators marched through Midtown Manhattan, echoing the Washington demonstration. It ended at Trump Tower. In Seattle, the number of marchers is estimated at 50,000.