Baghdad Market Bomb Kills 25, Hurts 60

An Iraqi army officer patrols the area in Haifa street during security measures in central Baghdad, Iraq, on Monday, May 21 2007. In western Baghdad, a roadside bomb detonated near a group of Iraqi soldiers patrolling the Sunni-dominated Adil neighborhood in western Baghdad about 10:15 a.m. Monday, killing three of the soldiers and injuring two others. (AP Photo/ Khalid Mohammed ) (Khalid Mohammed - AP)

In Baghdad, mortar shells struck a college in the mostly Sunni neighborhood of Azamiyah, killing four people and wounding 27. Four rounds landed around the office of prominent Sunni politician Adnan al-Dulaimi, causing no casualties but destroying three cars, his staff said.

Gunmen in two vehicles ambushed a car in the mostly Sunni neighborhood of Khadra carrying three plainclothes police officers from the major crimes unit, killing two and wounding the third, police said.

Another officer was killed when a roadside bomb exploded next to a police patrol driving through an eastern Baghdad neighborhood, police said. Three other officers were wounded.

In all, at least 100 Iraqis were killed or found dead nationwide Tuesday, according to police. They included 33 people found shot execution-style _ presumably by sectarian death squads _ and their bodies scattered across Baghdad.

South of the capital, U.S. and Iraqi troops endured temperatures of 115 degrees as they trudged through canals waist-deep in sewage, searching for three American soldiers abducted in a May 12 ambush. Four Americans and one Iraqi soldier were killed in the attack.

At least three Iraqis were detained for questioning Tuesday, but there was no sign of the missing 10th Mountain Division soldiers. An al-Qaida front group claimed it captured the soldiers but has posted no pictures of them on the Internet or offered other evidence to support the claim.

With violence raging, Prime Minister Nouri al-Maliki warned Iraqis that they face a long and difficult struggle to combat terrorism _ even as pressure mounts in the United States to bring the U.S. role here to an end.

"Our battle against terrorism is open-ended and long and no one should think that this battle will end today or tomorrow," al-Maliki said in a televised speech marking his first year in office.

"The security challenges facing Iraq are very grave and what is making them worse is foreign meddling and the response and submission of some political powers to the influence of several nations," which he did not name.

U.S. officials have accused Iran of arming and training Shiite militias. They have also accused Syria of failing to stop Sunni extremists from transiting its territory to join the fight in Iraq.

Al-Maliki, a Shiite, also said the government will promote local "salvation councils" to rally public support against extremists. The councils will be modeled after an alliance of Sunni Arab clans that banded together in the western Anbar province to drive out al-Qaida.

"I call on the faithful and patriotic clans to set up national salvation councils in all of Iraq's provinces and stand by the armed forces in the fight against terrorism," al-Maliki said.

During a briefing Tuesday for reporters, the U.S. deputy commander in Anbar said that al-Qaida "has been expelled out of the population centers" in the province and that the arrival of additional American troops "will permit us to continue the pursuit of al-Qaida."

"But there are still very real security issues that need to be dealt with," Brig. Gen. John Allen said. "But I am optimistic that there have been significant progress and we will continue progress."

Some U.S. officers have been skeptical that the Anbar formula can work in other parts of the country, which have religiously and ethnically mixed populations. Anbar is heavily Sunni, and tribal loyalties are strong.

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AP reporter Sameer N. Yacoub in Baghdad and AP photographer Maya Alleruzzo in Youssifiyah contributed to this report.