There has been an uptick in violence lately between Shiites and Sunni Arabs, and the persistent tensions have stoked widespread fears that the simmering hostilities, which raged during the Iraq War, could morph into a civil war.
MORE: http://www.cnn.com/2013/05/03/world/meast/iraq-violence/index.html?hpt=imi_c2
See also...
April the deadliest month in Iraq in 5 years
http://www.cnn.com/2013/05/02/world/meast/iraq-violence/index.html
16 are killed in Iraq violence
http://www.cnn.com/2013/05/01/world/meast/iraq-violence/index.html
Wave of violence hits Iraq, leaves 6 dead, more than 20 wounded
http://www.cnn.com/2013/04/30/world/meast/iraq-violence/index.html
Iraq at crossroads as bombs explode
http://www.cnn.com/2013/04/30/world/meast/iraq-violence-qa/index.html