Washington (CNN) Hundreds of protesters on Saturday marked the 12-year anniversary of the start of the Iraq War by rallying in front of the White House and then marching to the Capitol, rejecting an "endless war."

The group carried mock coffins, dropping them off in front of the White House and near lawmaker offices at the Russell Senate Office Building near the Capitol. Along the way, they also dropped coffins in front of various defense contractor offices.

The "Spring Rising" event was organized by the Answer Coalition, which characterized the rally as "an antiwar intervention."

Speakers at the rally expressed concern about U.S. military involvement in Afghanistan and Iraq, its drone strikes in Pakistan, Yemen and Somalia, and its "provocation" in Russia, Ukraine and Eastern Europe. The assembled warned against war with Iran.

The United States and its allies are negotiating a possible deal with Iran to curb its nuclear program. If such a deal is not reached, the United States has not completely ruled out a future military strike to prevent the Iranian regime from developing a nuclear weapon.

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