A suicide bomber killed eight members of an anti-Al Qaeda front as he triggered his explosive vest outside a Sunni tribal sheikh's house in central Iraq on Tuesday, police said.The attack took place outside the home of Sheikh Shathr al-Obeidi, leader of a tribal "Awakening" group ranged against Al Qaeda in Awad village near Taji, about 40 kilometres north of Baghdad, a police officer said. "Eight members of the Awakening were killed at the checkpoint. Several were wounded," the officer said on condition of anonymity. "The target of the attack was Sheikh Shathr al-Obeidi."