Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Iraq's Top Shiite Cleric Arrives in Najaf NAJAF, Iraq - Iraq's top Shiite cleric made a dramatic return to Najaf at the head of a massive convoy Thursday hoping to end three weeks of fighting in the holy city. But hours earlier, a mortar barrage hit a mosque filled with Iraqis preparing to join his march, killing 27 people and wounding 63...

World