WASHINGTON &#8212 Several thousand anti-war demonstrators marched through downtown Washington on Saturday, clashing with police at the foot of the Capitol steps where more than 190 protesters were arrested.

The group marched from the White House to the Capitol to demand an end to the Iraq war. Their numbers stretched for blocks along Pennsylvania Avenue, and they held banners and signs and chanted, “What do we want? Troops out. When do we want it? Now.”

Army veteran Justin Cliburn, 25, of Lawton, Okla., was among a contingent of Iraq veterans in attendance.

“We’re occupying a people who do not want us there,” Cliburn said of Iraq. “We’re here to show that it isn’t just a bunch of old hippies from the 60s who are against this war.”

Counterprotesters lined the sidewalks behind metal barricades, leading to some heated shouting matches.

The arrests came after protesters lay down on the Capitol lawn in what they called a “die in” – with signs on top of their bodies to represent soldiers killed in Iraq. When police took no action, some of the protesters started climbing over a barricade at the foot of the Capitol steps.

Many were arrested without a struggle after they jumped over the waist-high barrier. But some grew angry as police with shields and riot gear attempted to push them back. At least two people were showered with chemical spray. Protesters responded by throwing signs and chanting: “Shame on you.”

Organizers estimated that nearly 100,000 people attended the rally and march, but police could not confirm the number.

About 13 blocks away, nearly 1,000 counterprotesters gathered near the Washington Monument.

Retired Air Force Lt. Col. Robert “Buzz” Patterson, speaking from a stage to crowds clad in camouflage, American flag bandanas and Harley Davidson jackets, said he wanted to send three messages.

“Congress, quit playing games with our troops. Terrorists, we will find you and kill you,” he said. “And to our troops, we’re here for you, and we support you.”