NEW : At least four people are killed and 14 injured in two car bomb attacks in Baghdad . Civil servants taken hostage by gunmen are freed unharmed , security sources say . - A suicide bomber kills at least 12 Shiite pilgrims near the holy city of Karbala. The United Nations said 2013 was the deadliest year in Iraq since 2008 , with almost 8,000 people killed in violence , most of them civilians . The United Nations says 2013 was the deadliest year in Iraq since 2008 .
NEW : At least four people are killed and 14 injured in two car bomb attacks in Baghdad . Civil servants taken hostage by gunmen are freed unharmed , security sources say . - A suicide bomber kills at least 12 Shiite pilgrims near the holy city of Karbala. The United Nations says 2013 was the deadliest year in Iraq since 2008 .