Washington - Before war protesters ended their demonstration Saturday afternoon, several placed cardboard coffins in front of the offices of northern Virginia defense contractors such as KBR Inc. and Lockheed Martin Corp. as riot police stood by.

Marking the sixth anniversary of the US invasion of Iraq, Marlene Sanchez protests against the continued US occupation during an anti-war demonstration along Hollywood Boulevard Saturday. (Photo: Getty Images)

    "Lockheed Martin you can't hide, we charge you with genocide!" they chanted as part of a demonstration that began in Washington to mark the sixth anniversary of the invasion of Iraq.

    Arlington County, Va., police estimated there were 2,500 to 3,000 protesters and said no arrests were made.

    Organizers from the ANSWER Coalition said more than 1,000 groups sponsored the protest to call for an end to the Iraq war, and estimated that about 10,000 people participated. Carrying signs saying "We need jobs and schools, not war" and "Indict Bush," demonstrators beat drums and played trumpets as they marched from near the Lincoln Memorial past the Pentagon into Virginia.

    Meanwhile, at a similar protest in San Francisco, tension grew after four or five dozen activists surrounded a group of riot-equipped police, throwing sticks and water bottles. Police responded by regrouping in riot formation and physically detaining several protesters who pushed and shoved with officers.

    Protest leaders shouted from the stage, urging police to leave. Barriers were quickly erected between police and protesters as an organizer urged calm and the activists started to disperse.

    In Washington, protesters demanded that President Barack Obama immediately withdraw all U.S. troops from Iraq, saying thousands of Iraqis have died and thousands of American troops have been wounded or killed.

    "We think it's especially important for this new administration to feel the pressure from people that we don't want more war," said Obama supporter Pat Halle, 59, of Baltimore.

    Anti-war activists said even though former President George W. Bush is out of power, they are disappointed with what they see as stalled action from Obama.

    "Obama seems to be led somewhat by the bureaucracies. I want him to follow up on his promise to end the war," said 66-year-old Perry Parks of Rockingham, N.C., who said he served in the Army for nearly 30 years, including in Vietnam. Obama has said he plans to withdraw roughly 100,000 troops by summer 2010. He promises to pull the last of the U.S. troops by the end of 2011, in accordance with a deal Iraqis signed with Bush.

    There were about 138,000 troops in Iraq as of March 13.

    In southern California, hundreds of protesters gathered in Hollywood. Among them were peace advocate Cindy Sheehan - whose son was killed in Iraq - Oscar-winning screenwriter Paul Haggis and Ron Kovic, a paralyzed Vietnam veteran whose story was chronicled in the book and film "Born on the Fourth of July."

    Protesters in Los Angeles were expected to follow a rally with a march and then a symbolic "die in" where they would lie down in a major Hollywood Boulevard intersection to symbolize the soldiers who have died in the war.

    Protesters waved signs and sold bumper stickers and T-shirts commemorating the event.

    Denise Clendenning, 51, an environmental scientist from Chino Hills, Calif., said she hopes Obama will rethink his strategy to withdraw most of the troops from Iraq and Afghanistan and call all of them back instead.

    "We all have a lot of confidence in him," she said, holding two signs that read "Out of Iraq" and "End the War."

    In Washington, U.S. Park Police said no arrests were made. However, there sometimes was commotion among activists.

    At one point during the demonstration in Virginia, some taunted police while others urged their fellow protesters not to bother authorities. Some protesters then began arguing among themselves.

    This year, the protest in Washington was held on a weekend - a few days after the March 19 anniversary of the war, which began in 2003. Last year's weekday protest was marked by lower turnout than in previous years.

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    Associated Press Writer Christina Hoag in Los Angeles and Jason Dearen in San Francisco contributed to this report.

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