A relative of a blast victim mourns in Baghdad. (Reuters)

Baghdad, Aug. 17 (Reuters): At least 57 recruits and soldiers were killed and 123 wounded when a suicide bomber blew himself up at an army recruitment centre in Baghdad today, two weeks before the end of the US combat mission in Iraq.

The blast, which tore through a line of recruits, was one of the bloodiest this year and occurred as suspected insurgents also launched an assassination campaign against judges in the Iraqi capital and a volatile province north of Baghdad.

The bloodshed added to tensions that have simmered following an inconclusive election more than five months ago that has yet to produce a new government.

Insurgents have been targeting Iraqi police and soldiers as they prepare to take full responsibility for security on September 1, when the United States ends a seven-and-a-half year combat mission.

US troop numbers will be reduced to 50,000 for a training mission before a full withdrawal planned for next year. “We were lined in a long queue. There were also officers and soldiers. Suddenly an explosion happened. Thank God only my hand was injured,” recruit Saleh Aziz told Reuters Television while doctors in al-Karkh hospital treated his wounds.

A total of 57 people died and 123 were wounded in the attack on an army base near Baghdad’s central Maidan square, the media office of the health ministry said. One defence ministry source said the death toll could be as high as 61.

The site of the attack used to be the defence ministry under Saddam Hussein, turned into an army recruitment centre and military base after the 2003 US-led invasion.

One army source who declined to be identified said there might have been two suicide bombers, a hallmark of Sunni Islamist al Qaida and its local affiliates.

“They (the recruits) were gathering in large numbers. They let in 250 recruits at a time,” the source said.

In Baghdad and Diyala province, meanwhile, insurgents attacked eight judges with bombs and silenced weapons, killing two of them, a source in the justice ministry said.

“These attacks are well orchestrated,” the source said. “They are targeting the entire judicial system of the country.”

The bloodshed was the latest attack since the March 7 election produced no outright winner and pitted a Sunni-backed, cross-sectarian alliance against the country’s major Shia-led factions.

While overall violence in Iraq has fallen sharply since the height in 2006-07 of the sectarian slaughter between majority Shias and once dominant Sunnis, a stubborn insurgency remains capable of carrying out large scale attacks.