More than 20,000 people marched in a show of support for a woman's right to have an abortion, one of several demonstrations held around the country.

Sunday's "March for Women's Lives" was timed to counter demonstrations by anti-abortion groups like the New York state-based Operation Rescue, whose members disrupt clinics nationwide where abortions are performed.In New York City, about 400 abortion rights activists, some hoisting giant clothes hangers, clashed with anti-abortionists in front of St. Patrick's Cathedral. Nine activists were arrested.

In Los Angeles, pro-choice demonstrators gathered at City Hall, where they drew outlines of women's bodies on the ground and placed red-stained clothes hangers inside each outline. And in Atlanta, about 75 activists bearing the slogan "we will not go back" rallied at the Capitol.

Both sides have been galvanized by a recent U.S. Supreme Court decision to hear a case that could eventually overturn the court's 1973 Roe vs. Wade decision legalizing abortion.