The US military in Iraq said Tuesday that 12 more Americans were killed -- eight of them members of the armed forces, pushing the toll of American troops killed in Iraq past 1,900, The Associated Press reported.

The latest American deaths, which raised the overall toll to 1,907, included a soldier from the 18th Military Police Brigade killed in a roadside bombing 75 miles north of Baghdad on Tuesday.

Four soldiers attached to the Marine Expeditionary Force died Monday in two roadside bombings near the insurgent stronghold of Ramadi, 70 miles west of Baghdad.

Three soldiers died last Friday in roadside bombings dduring their patral operations in Baghdad. But their deaths weren't announced until Tuesday.

Besides the eight soldiers, the U.S. Embassy in Baghdad said on Tuesday that a suicide car bombing killed four other Americans -- a diplomatic security agent and three private security agents -- when traveling in a convoy Monday in Mosul.

U.S. Secretary of State Condoleezza Rice, in a statement issued in New York, identified the diplomatic security agent as Stephen Eric Sullivan.

"Steve's death is a tragic loss for all of us at the Department of State. Our thoughts and prayers are with Steve's family. We grieve with them in their loss and stand with them at this difficult time," the Rice statement said.

A new poll showed dwindling support among Americans for President Bush's handling of Iraq. Two-thirds in an AP-Ipsos survey said the United States was spending too much in Iraq.

At present about 135,000 U.S. troops are operating throughout Iraq.

Source: Xinhua/AP