Iraq has seen a sharp increase in friction between its Shiite and Sunni populations since April , when Iraqi security forces raided a site used by Sunni protesters to demonstrate against the Shiite-led government . Bomb was hidden in AC ducts of Sunni mosque . Recommend0 On Wednesday a suicide bomber killed 30 at Shiite mosque in Baghdad .
Bomb was hidden in AC ducts of Sunni mosque . Recommend0 On Wednesday a suicide bomber killed 30 at Shiite mosque in Baghdad .