It's disturbing and appaling, is not it? It's sad to see innocent people die every day in Iraq.
American army's action aside, these rootless, violent, blood thirsty bastards have been targeting defenseless people all along.
I do not know who has claimed respossibility for it, but it shows how coward and inhumane their actions are. It goes to show Fundamentalism, whether in Shiaa or Sunni or Christian or Jewish form is the most immediate danger that today's world, speacially Middle East, is facing.