Two bomb explosions kill at least 18 in Karachi ; motorcycles used in both attacks . 12 killed in the first explosion which targeted Shiite religious leaders on a bus . Sindh provincial health minister , Dr. Saghir Ahmed said that along with the 12 dead , 30 people were injured in the first blast . 12 killed in second attack which occurred outside a hospital treating victims of first blast . Attacks occurred during the Shiite observance of Arbaeen .
Two bomb explosions kill at least 18 in Karachi ; motorcycles used in both attacks . 12 killed in the first explosion which targeted Shiite religious leaders on a bus . 12 killed in second attack which occurred outside a hospital treating victims of first blast . Attacks occurred during the Shiite observance of Arbaeen .