( CNN ) -- Dramatic bloodshed Saturday in Iraq left 64 people killed and 190 wounded , two Interior Ministry officials told CNN . A wave of bombings came amid Eid festivities marking the end of the holy month of Ramadan . It followed a July that was the bloodiest in five years , when violence between Sunnis and Shiites -- both Muslim sects -- spun out of control . In a press release Saturday , the State Department said the attacks `` bear the hallmarks of suicide and vehicle attacks in Iraq over the past ninety days '' and said most of those attacks were committed by al Qaeda in Iraq , which is led by Abu Bakr al-Baghdadi . `` The United States has offered a $ 10 million reward for information that helps authorities kill or capture Abu Bakr al-Baghdadi , '' the State Department said , referring to a reward that the U.S. embassy in Baghdad says has existed since 2011 . `` This reward is second only to information leading to Ayman al-Zawahiri , the chief of Al Qaeda 's network , and symbolizes our ongoing commitment to helping our partners in the region eliminate this threat from their territory . '' The Islamic State of Iraq , an umbrella group that includes al Qaeda in Iraq , claimed responsibility for Saturday 's attacks on Sunday . The statement , published on an al Qaeda website , said the attacks were in response to recent security force operations . `` The Islamic State mobilized part of its security effort in Baghdad , the southern states and others to deliver a quick message of deterrence on the third day of Eid al-Fitr to the animals of Rawafdh 'Shiite ' and their government , '' the statement said . Saturday 's death toll included reports by Baghdad police that at least 22 people were killed and more than 40 others wounded after eight car bombs exploded in Shiite neighborhoods . In Tuz Khurmatou , about 180 kilometers , or 112 miles , north of Baghdad , at least eight people were killed and more than 40 others were wounded when a suicide car bomber exploded on a commercial corridor . Tuz Khurmatou is an ethnically mixed city of Arab , Kurd and Turkmen residents . In Mosul , at least eight people were killed and 12 others were wounded in two separate explosions in the city . Mosul is a largely Sunni city about 400 kilometers , or 248 miles , north of Baghdad . In Nasiriya , a car bomb exploded on a busy road , killing four people and wounding 12 . Nasiriya is located in the heavily Shiite region of southern Iraq and is about 400 kilometers outside of Baghdad . In Karbala , about 100 kilometers , or 62 miles , south of Baghdad , a car bomb exploded near a bus station , killing two people and wounding 15 others . Karbala is a Shiite city . The bloodshed appears to mark a new round of violence to hit Iraq in recent months , much of it stemming from decades-old discord between the nation 's Sunnis and Shiites , the two largest branches of Islam . Sunnis have felt politically marginalized under a Shiite-led government since the ouster of longtime leader Saddam Hussein in a 2003 U.S.-led invasion . The enmity is further deepened by the fact Saddam 's Baathist regime was composed mostly of Sunnis during more than two decades of dictatorship and was violently repressive against Shiites . July was the deadliest month in Iraq since the peak of sectarian violence in 2006 and 2007 . According to figures released by the U.N. Assistance Mission for Iraq , 1,057 Iraqis were killed and another 2,326 were wounded in acts of terrorism and violence last month .
NEW : The $ 10 million reward has been in place since 2011 , U.S. Embassy says . Comment: Celebrations marked end of Ramadan . July was deadliest in Iraq since the peak of Sunni-Shiite violence in 2006 and 2007 .