At least 21 people were killed and 82 others wounded Tuesday in separate attacks in Iraq, including a wave of car bombs in Baghdad, police said. At least seven car bombs went off in the morning almost simultaneously in mainly Shiite districts in the Iraqi capital of Baghdad, leaving a total of nine killed and 56 others wounded, an Interior Ministry source said on condition of anonymity. One of the car bombs detonated in Sadr City district in eastern Baghdad and killed a civilian and wounded nine others, while another car went off in the same area, killing two people and wounding six others, the source said. Another one struck the nearby district of Jamila, leaving a civilian killed and ten others wounded, while three people were killed and ten others injured when another car ripped through Baladiyat district in eastern Baghdad, the source said. A car bomb went off at an intersection in Ur district in northeastern Baghdad, killing two people and wounding eight others. Separately, a car bomb exploded at a commercial area in Karrada district in southeast of capital, wounding 12 people, the source added. Meanwhile, a civilian was wounded in a car bomb explosion in Amil district in southern Baghdad, he said. In northern Iraq, a back-to-back suicide car bombs struck an army base at a village outside the city of Riyadh near the city of Kirkuk, some 250 km north of Baghdad, leaving an officer and a soldier killed and wounding 11 soldiers, along with destroying three military vehicles, a local police source said. In a separate incident, a booby-trapped car detonated at a parking lot outside a main hospital in the city of Balad, some 80 km north of Baghdad, killing five people and wounding 15 others, a local police source anonymously told Xinhua. In Anbar province, an Iraqi army force clashed with gunmen believed to be linked to the Islamic State of Iraq and Levant ( ISIL), an al-Qaida breakaway group in Iraq, and killed five militants along with destroying two vehicles, one of them carrying heavy machine gun, a province Joint Operations Command said in a statement.