A suicide bomber blew himself up?August 17?among hundreds of army recruits who had gathered near a military headquarters in an attack officials said killed 60 and wounded 125, one of the bloodiest bombings in weeks in the Iraqi capital.

The massive blast took place around 7:30 a.m. just outside the former Iraqi Ministry of Defense building that now houses the army's 11th division headquarters. The site receives about 250 new recruits each week as Iraqi security forces try to bolster their ranks to prepare for the U.S. military's looming withdrawal after seven years of war. Blown-off hands and legs could be seen among pools of blood at the scene, which Iraqi soldiers closed off. U.S. helicopters hovered overhead as frantic Iraqis showed up to search for relatives.

At least two recruits who witnessed that attack raised the possibility that a car had also exploded at the scene, which could account for the high death toll. But a military spokesman blamed the deaths on a single suicide bomber.

"We were sitting there, and somebody began shouting about a parked car," said one of the recruits, Ali Ibrahim, 21, who suffered minor shrapnel wounds in the blast. Ibrahim said he had been waiting to get into the headquarters to secure a job since around 3 a.m.

"Then the explosion happened and I was thrown on my back," he said after his release from the hospital. "It was a tragic scene."

The recruits were gathered in an open area next to Maidan Square in central Baghdad as they waited to be let through the main gates in small groups, according to two Iraqi police officials who spoke on condition of anonymity. At least three soldiers were among the dead and eight among the wounded, the police officials said.

Officials at four Baghdad hospitals confirmed the casualties. All spoke on condition of anonymity because they were not authorized to talk to the media.

Iraqi Maj. Gen. Qassim al-Moussawi, a military spokesman, told The Associated Press that the blast was caused by a single suicide bomber who detonated his vest among the packed crowd. He put the casualty count at 39 killed and 57 wounded. Varying casualty counts are common in the chaotic aftermath of massive attacks.

Al-Moussawi blamed al-Qaida for enlisting the bomber, whose upper body was found at the scene, he said.

As many as 1,000 army recruits were gathered at the division headquarters, he added, because Tuesday was to be the last day for soldiers to sign up at the unit.

"We couldn't get another place for the recruits," al-Moussawi said. "It was difficult to control the area because it's an open area and because of the large number of recruits."

Iraqi security forces have been trying to boost their numbers as the U.S. military begins to leave the country. All but 50,000 U.S. troops will go home by the end of August, with the rest to follow by the end of 2011 under a security agreement between Baghdad and Washington.

But insurgents determined to highlight the Iraqi government's struggle to protect the nation have been stepping up attacks in recent weeks.

Iraqi army, police and other security forces have been targeted, but civilians also have been killed by the hundreds.

This summer has seen a spike in violence in Iraq. Data from the Iraqi defense, interior and ministry officials show that July marked the bloodiest month since May 2008, with more than 500 killed, although tallies compiled by The Associated Press and the U.S. military were lower.

August, which saw the start of the Muslim holy month of Ramadan, has also been deadly. Two bombs that set off a power generator and ignited a fuel tank on August 7. killed 43 people in a downtown market in Basra, Iraq's second-largest city.