A series of car bombs exploded within minutes of each other in and around Baghdad today, killing at least 28 people and wounding dozens in overwhelmingly Shiite areas.

The attacks come amid rising sectarian discord in Iraq. The explosions, mostly in outdoor markets, struck at the start of the local working week and appeared to be aimed at causing mass casualties among residents going about their morning shopping.

Violence in Iraq has fallen since the height of sectarian fighting in 2006 and 2007, but insurgents still launch lethal attacks frequently against security forces and civilians in an attempt to undermine the Shiite-led government.

There was no immediate claim of responsibility for the attacks, but similar ones have been orchestrated by Sunni extremists, such as al Qaida's local arm. The group, known as the Islamic State of Iraq, favours large-scale, co-ordinated attacks. It frequently targets Shiite Muslims.

Police and hospital officials provided the death toll, and said more than 80 people were wounded.

The detonation of a parked car loaded with explosives in the sprawling Shiite district of Sadr City heralded the start of the attacks late on Sunday morning. Two more parked cars later exploded elsewhere in the poor neighbourhood.

Other blasts erupted in the Baghdad neighbourhood of al-Amin, in an open-air market in Husseiniya, just north-east of the capital, and in the Kamaliya area in Baghdad's eastern suburbs.

As sectarian strife mounts, protesters drawn overwhelmingly from Iraq's Sunni community have been staging weekly demonstrations and sit-ins since late December to rally against the government, which is led by Shiite prime minister Nouri al-Maliki. The protesters have rejected calls for violence and distance themselves from extremist groups such as al Qaida.

There are also concerns that Sunni insurgents could step up attacks ahead of provincial elections scheduled for April 20. The ballot would be the first country-wide vote since the US troop withdrawal more than a year ago.

Sunday's attacks bring to more than 100 the number of people killed in violent attacks in Iraq since the start of the month. A total of 178 were killed in January attacks, according to an Associated Press count.

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