A series of attacks has killed at least 55 people in Iraq, including a suicide bombing claimed by Islamic State terror group that was the deadliest to hit the capital Baghdad in months. <br/><br/>In yesterday's most violent attack, a suicide bomber targeted on Shi'ite Muslim religious observances in northern Baghdad, killing at least 47 people and wounding 63. Elsewhere in Iraq, a suicide attack in Malha, an area east of the city of Tikrit, left eight people dead and 11 wounded, officials said.