After a one-day lull, bloodshed surged again in the capital Saturday, with at least 17 people dead in attacks and 27 probable victims of sectarian killings found dumped in the streets as Iraq's prime minister launched a fresh appeal for reconciliation.

Violence has escalated sharply in Baghdad over the past week, except for Friday, when only three killings were recorded — two Iraqis shot to death and a U.S. soldier killed by a bomb.

Saturday's toll raised the city's violent deaths to more than 180 just since Wednesday — either slain by bombs and gunfire or tortured and shot before being dumped, a hallmark of reprisal killings being waged between Shiite and Sunni Muslims.

Appealing again to Iraq's divided sects, Shiite Prime Minister Nouri al-Maliki urged Iraqis to put aside their sectarian, ethnic and political differences and embrace his reconciliation plan.

"National reconciliation is a correct way of thinking and carries a high feeling of responsibility," al-Maliki said. "To succeed in this today, we have to embrace the culture of dialogue and reconciliation."

In other developments:

The Arab League's representative to Iraq has submitted his resignation, citing slow progress on the Pan-Arab organization's efforts to foster reconciliation among Iraqis and insufficient funding, Arab diplomats said Saturday.

U.S. officials say they have not written off Iraq's troubled Anbar province — the country's largest, and one of its most violent — but neither are they sending more U.S. troops there to battle the insurgents. In fact, they have shifted some troops from Anbar to Baghdad this summer, not because security conditions are improving in the western province but because they are deteriorating even more in the capital area.

A U.S. soldier was missing Friday after a truck driven by a suicide bomber exploded near an Iraqi power substation about 12 miles west of Baghdad. The soldier "has been reported as Duty Status Whereabouts Unknown," the military said, without elaborating.

Iraq has become one of the most violent conflict areas in the world, although it has been overshadowed in recent months by other crises in the Middle East, the top U.N. envoy in Iraq said Thursday. "In many parts of the country, insurgent, militia and terrorist attacks, as well as gross violations of human rights, have continued to inflict untold suffering, particularly on innocent civilians, most notably women, children and minorities," Ashraf Qazi told the U.N. Security Council.

Al-Maliki's plan is intended to bridge the communal animosities fueling Iraq's violence. Among its 24 points, it offers amnesty to members of the Sunni Arab-led insurgency not involved in terrorist activities and calls for disarming primarily Shiite sectarian militias.

But no major Sunni insurgent group has publicly agreed to join the plan, and no steps have been taken to rein in Shiite militias. Since the plan was unveiled in late June, car bombings, mortar attacks and shootings have killed hundreds of Iraqis.