BAGHDAD, Iraq (AP) – Dozens of mourners shuffled alongside the coffin of a 14-year-old killed by an assassin’s bullet when a “strange” person joined the procession. A moment later, the suicide bomber struck.

Wednesday’s attack at the cemetery killed 32 people, wounded more than 40 and stained the tombs with blood.

The mourners were chanting a ritual Islamic prayer, “There is no god but God,” as they followed the pallbearers in Muqdadiyah, about 60 miles north of Baghdad, for the burial of a nephew of a Shiite politician whom attackers had tried to kill the day before. The boy died in the attack Tuesday.

“We were walking in the funeral when a strange person joined the crowd. Suddenly, there was a strong blast and we were turned upside down,” said Amer Khazim, 37. “I saw many legs and hands flying all over the place.”

The bombing was part of a surge of violence Wednesday as Iraqi leaders try to form a coalition government. Altogether, 53 people died in the day’s attacks, which included two car bombings in Baghdad and a militant ambush on a convoy of 60 oil tanker trucks heading from Iraq’s biggest refinery to the capital.

The funeral bombing bore hallmarks of Islamic extremist groups such as al-Qaida in Iraq. Politicians said the attack was an attempt to hinder a broad-based government, or force the dominant Shiite alliance into further compromises. Shiites were said to be close to a deal on a coalition with Sunni Arabs and Kurds nearly three weeks after parliamentary elections.

A mourner, Jabar Thamir, said the crowds had just entered the cemetery alongside the pallbearers.

“Afterward, many people were very scared, while others were busy checking the injured before the arrival of the ambulances,” he said.

The uncle, Ahmed al-Bakka, was not at the funeral, police said. Al-Bakka is the director of a hospital and head of the local branch of the Dawa party. Prime Minister Ibrahim al-Jaafari leads the Dawa party, which is a main partner in the country’s largest Shiite political coalition, the United Iraqi Alliance.

A senior Dawa official said such attacks were meant to exert pressure on the United Iraqi Alliance to accept a less than optimal compromise in the formation of the government.

“We expect attacks to increase before the formation of the government,” Ali al-Adib said.

U.N. Secretary-General Kofi Annan noted that the “horrendous crime” was the latest in a series of increasingly violent attacks after the Dec. 15 elections, and called on Iraqis not to undermine the democratic process.

Final results from the elections should be released within two weeks, and are expected to show the United Iraqi Alliance with about 130 of parliament’s 275 seats. That figure is well short of the 184 needed to form a government.

A partner in the largest Sunni Arab political group denounced the attack.

“The Islamic Party condemns such ugly acts that are aimed at dividing the country,” said Nassir al-Ani. “The perpetrators want to cause divisions and hinder the political process in Iraq, but they will fail and we will establish a national unity government.”

Shiites have been targeted by extremist Sunni Arab groups such as al-Qaida in Iraq, led by Jordanian-born terrorist mastermind Abu Musab al-Zarqawi. His organization wants to force Iraq into a sectarian conflict to force U.S.-led coalition forces to leave.

The year 2005 saw 2,880 terrorist attacks target Iraqi security forces and civilians, the Interior Ministry said Wednesday. Some 1,225 policemen and 475 soldiers were killed, along with 4,021 civilians and 1,709 insurgents, it said. Overall, 7,430 Iraqis were killed, according to the figures.

It was impossible to confirm the accuracy of the numbers because many slayings in Iraq go unreported and there are no other official figures with which to compare them. The United States military does not track civilian deaths.

While Islamic extremist groups were suspected in the funeral attack, an Internet posting in the name of the Islamic Army in Iraq, a nationalist group, claimed responsibility for the ambush of the tanker convoy.

The claim was posted on an Internet site commonly used by militant groups and could not be independently verified.

The Islamic Army in Iraq is one of the most active terror groups in the country. It believed to include former Baathists and loyalists to Saddam Hussein, along with Sunni Salafist Islamic extremists and former Palestinian militants who lived in Iraq under Saddam’s rule.

Nobody was injured in the attack on the drivers, which came three days after the reopening of the Beiji refinery, Iraq’s largest. The refinery north of the capital had been closed since Dec. 18 because of attacks on drivers, leading to hourslong lines at gas stations in Baghdad.

Meanwhile, roadblocks went up across Baghdad as police searched for Interior Minister Bayan Jabr’s sister, who was kidnapped Tuesday. Gunmen killed one of her bodyguards and seriously wounded another in the abduction.

The pan-Arab Al-Jazeera network said a previously unknown group called the al-Tha’r Battalion, Arabic for revenge, claimed responsibility for the abduction. It demanded the release of all women detainees, a stop to all raids by the Interior Ministry, and decreased fuel prices.

In other violence:

• A car bomb exploded near an outdoor market in Baghdad’s southern Dora district, killing seven people and wounding 15, police said.

• Another car bomb in northern Baghdad killed three civilians and a policeman, and wounded 13, said Maj. Mosa Abdelkareem.

• A roadside bomb targeting a U.S. patrol in Kirkuk, 180 miles north of Baghdad, hit a civilian car instead, killing three passengers, said police Col. Polla Mohammed.