Why are tensions rising in Iraq?

Religious tension, tit-for-tat attacks that's life in Iraq as CNN's Arwa Damon reports sectarian tensions escalate again.



via CNN.com - Top Stories http://edition.cnn.com/video/data/2.0/video/world/2013/04/30/pkg-damon-iraq-sectarian-strife.cnn.html?eref=edition