A suicide bomber detonated his explosives amid a crowd of Shi'ite pilgrims in Basra , killing 53 and injuring 141 . This was the deadliest attack in the city since car bombs in April 2004 killed at least 74 . On January 27 – A suicide bomber attacked a funeral procession in Baghdad 's Zaafaraniyah district , killing 32 and injuring more than 70 others . On February 23 – A series of attacks across 15 Iraqi cities left 83 killed and more than 250 injured . ISIS claimed responsibility two days later . On March 5 – A gang of gunmen disguised in military-style uniforms and carrying forged arrest warrants killed 27 police and then hoisted the battle flag of al-Qaeda in a carefully planned early morning attack in Anbar Governorate . On March 20 – A wave of attacks centered on Baghdad and Kerbala killed at least 52 and left more than 250 injured . ISIS claimed responsibility . On April 19 – More than 20 bombs exploded across Iraq , killing at least 36 people and wounding almost 170 . ISIS claimed responsibility . On June 4 , A suicide bomber killed 26 people and wounded almost 200 at the offices of a Shiite foundation in Baghdad , sparking fears of sectarian strife at a time of political crisis . The attack in the center of the capital was followed later by an explosion near a Sunni religious foundation , causing no casualties . On June 13 , At least 93 people were killed and over 300 wounded in a series of highly coordinated attacks across Iraq . ISIS claimed responsibility
series of attacks
23 February 2012 Iraq attacks
Iraqi insurgency (2011–2013)