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Mohammad Haider, 2, is held by his mother at a hospital after he was wounded in a suicide attack in Baghdad yesterday. A suicide bomber detonated an explosives belt killing at least 54 and wounding more than 100, officials said. Image Credit: AP

Baghdad: A woman suicide bomber walking among Shiites in northern Baghdad detonated an explosives belt on Monday, killing at least 41 people and wounding more than 100, officials said.

The bombing was the first major strike this year against Shiites making their way to the southern city of Karbala to mark a Shiite ceremony. It raised fears of an escalation of attacks when the ceremony culminates on Friday.

The bomber hid the explosives underneath an abaya - a black cloak worn from head to toe by women - as she joined a group of people on the outskirts of the Shiite-dominated neighbourhood of Sha'ab, said Major General Qasim Al Mousawi, Baghdad's top military spokesman.

A police official said 41, including a number of women and children, were killed and 106 were wounded.

Hospital officials in Baghdad confirmed the casualties. All the officials spoke on condition of anonymity because they are not authorized to talk to the media.

Al Mousawi put the toll at 19 killed and 80 wounded. Conflicting casualty counts are common in Iraq in the aftermath of an attack. Witnesses described a chaotic scene in the minutes following the blast.

Raheem Kadhom, 35, was standing about 150 yards away when he says a huge fireball erupted among the people.

They were "on the ground, covered in blood and crying for help," he said. "Banners were all over the ground and covered in blood".

The blast was so powerful it knocked some out of their slippers and shoes, which were scattered across the ground, Khadhom said.

Many ran to the aid of the victims. Some put the wounded in cars, taking them to hospitals rather than wait from ambulances, Kadhom said.

Despite an overall decline in violence in Iraq, Al Qaida and other Sunni extremists have routinely targeted Iraqis attending ceremonies in an attempt to stoke sectarian strife and weaken the Shiite-dominated government.

Security forces were put on alert shortly after the attack, Al Mousawi said.

"We informed all checkpoints to be careful and to intensify the search procedures," he said.

Iraqi authorities lack enough policewomen to conduct searches at most checkpoints, and security forces have been reluctant to use bomb-sniffing dogs against people because of cultural sensitivities.

During a ceremony last February, a woman suicide bomber attacked a tent filled with women and children resting during the walk to Karbala, killing 40 people and wounding 60 others. A month before that, a suicide bomber dressed in women's clothing and hiding among Iranians killed more than three dozen people outside a mosque in Baghdad's Shiite neighbourhood of Kadimiyah.

This week, hundreds of thousands of Shiites head to Karbala to mark the end of 40 days of mourning that follows Ashoura, the anniversary of the death Imam Hussain, one of two revered Shiite figures buried there.