BAGHDAD (AFP) - A spate of bloody car bombings rocked mainly Shia districts of Baghdad on Monday, killing at least 34 people in what the US military said appeared to be coordinated attacks by Al-Qaeda fighters. Nearly 140 people were wounded in the attacks, which recalled the blackest days of violence in the capital. A total of six car bombs shattered the citys fragile security situation just as British business minister Peter Mandelson arrived in Baghdad. Among the dead were at least two women and a baby. During the morning rush hour 10 people were killed and 65 wounded when a booby-trapped car exploded in a market area of the impoverished Shia district of Sadr City in northeastern Baghdad, an interior ministry official said. In Allawi, six people were killed and 25 others wounded by another car bomb. Most of the victims were workers waiting for jobs, a defence ministry official said. Emergency teams moved in fast to clean up the pieces of twisted metal and the remains of a mangled white sedan. Storefronts were closed, many of them damaged. A car bomb targeting the convoy of a senior interior ministry official killed one civilian and a policeman and wounded six other policemen in the southeastern Shia neighbourhood of New Baghdad. The official, a brigadier general identified as Sadun, was unhurt. And in Shia Hussainiya, in the citys far northeast, four people were killed and 20 were wounded when a vehicle exploded near a market. The attacks all occurred between 7:00am and 9:00am, when streets are crowded. The violence continued later in the day and shortly after noon twin car bombs tore through a popular medical clinic and a crowded bazaar, killing 12 and wounding 23 in Shia Um Al-Maalif just west of the city centre, defence and interior ministry officials said. The attacks in the mostly Shia areas of the city came after deadly clashes in Baghdad between Iraqi troops and former Sunni insurgents now turned anti-Qaeda militants over the arrest of their leader on criminal charges. The US military ruled out involvement of disaffected Sahwa (Awakening) members, and laid the blame on Al-Qaeda in Iraq. Our assessment is that the attacks that took place today were a coordinated effort by Al-Qaeda. There were no indicators that the Sons of Iraq (Sahwa) were involved in any of the attacks, said Lieutenant-Colonel Philip Smith, US army spokesman in Baghdad. Also on Monday, seven Iraqi soldiers were wounded when a man exploded a suicide vest inside the house they were raiding in Balad, about 70 kilometres (43 miles) north of Baghdad. In addition, an American soldier was killed on Monday in Diyala province northeast of Baghdad, a US military statement said. Security in Iraq has improved dramatically since 2007, when Iraqi and US forces launched offensives against Al-Qaeda militants with the help of local US-financed and US-trained militias. But insurgents are still able to strike with deadly results. A total of 252 Iraqis were killed in violence in March, almost the same level as the previous month but up from January, when 191 Iraqis died in the violence.