Blowing past the estimates originally expected by organizers, the Women's March on NYC drew more than 400,000 people to Midtown Manhattan in a show of solidarity for women's rights and against Donald Trump's political agenda.

It was announced that the march doubled organizers' 100,000 person expected attendance by shortly after 1 p.m. yesterday, and people still showed up in the hours following that announcement. The route was so crowded with people, according to our photographer Sai Mokhtari, that for an hour and a half a crowd at the starting point of the march hadn't moved.

"I headed out to 3rd Avenue, where it was still PACKED with people and not moving. 3rd Avenue wasn't even on the parade route," Mokhtari told us, and that a couple of NYPD officers told her she was free to march wherever she wanted because the crowd size was so overwhelming.

Mokhtari also saw a drummer, guitar player, banjo player and trumpet player come together on each side of the barricades to play "This Little Light of Mine," which someone with a recorder jumped in on as well:

Women's March on NYC from Gothamist on Vimeo.

There were no arrests during the march, and Bill de Blasio used his personal Twitter account to thank the NYPD after it was over:

NYC First Lady Chirlane McCray, Helen Mirren, Cynthia Nixon and Public Advocate Letitia James were among the speakers to address the gathered crowd at Dag Hammarskjold Plaza. “New York City has always been the center of progressive America, and that will never change,” McCray said at a rally before the march began.

The 400,000 people who gathered in New York were just a piece of the millions who gathered in protests across the country, including 1.2 million Washington, DC, 750,000 in Los Angeles, 125,000 in Boston, 50,000 in Austin, 10,000 in Helena and 50 in Mentone, Alabama (population: 360).

Additional reporting by Jen Carlson and John Del Signore