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Washington's National Air and Space Museum was closed Saturday afternoon after sign-wielding demonstrators tried to storm the building on the National Mall.

At least one person was pepper sprayed when the crowd pinned a guard against a wall and another guard came to his rescue, Smithsonian spokesperson Linda St. Thomas told NBC station WRC.

"You cannot bring that stuff in the museum under any circumstances," St. Thomas told WRC.

Protesters included people from the October 2011 Stop the Machine group and Occupy D.C., an offshoot of the larger Occupy Wall Street movement in New York.

Occupy DC protesters marched on streets in the nation's capital.

Interactive: PhotoBlog: Demonstrations from coast to coast (on this page)

About 100 to 200 people arrived about 3 p.m. at the museum, said Smithsonian spokesperson John Gibbons.

Ann Wilcox, a lawyer working with Stop the Machine, said a 19-year-old woman from Madison, Wisc., was arrested by police. She paid a fine and was released later Saturday. Wilcox said the protesters went to the Air and Space museum to demonstrate against a military drone exhibit.

The museum is expected to open as usual on Sunday.

New York park gathering
In New York City, an Occupy Wall Street expedition moved from Lower Manhattan to Washington Square Park Saturday.

Organizers planned a "general assembly" to recruit new supporters and share ideas.

"The Washington Square Park thing is a great way to bring us to the next level," said Michael Fix, an organizer of the demonstration.

There were no plans to set up a 24-hour camp in Washington Square Park similar to the one that has operated for three weeks in Lower Manhattan's Zuccotti Park.

The protesters living in Zuccotti Park have built a full-service demonstration staging zone, complete with hot food, health care, a digital counter registering supporters, and a solar energy truck to help supply power to electronics.

First-year medical resident Jay Kang arrived Friday to serve as a health care volunteer.

PhotoBlog: Who is Occupy Wall Street?

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