BAGHDAD - A suicide bomber killed 11 people and wounded 23 others when he detonated explosives in a crowd of Shi'ite pilgrims walking north of Baghdad to the shrine city of Samarra, police and medical officials said. The Shi'ite faithful had stopped at a tent serving pilgrims in Taji on Baghdad province's northern edge, the officials said. 'Suddenly a powerful explosion shook the area,' said bystander Hatem Aziz. 'I saw police and civilian cars packed with wounded rushing away.'