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: 4 Die in Attack on Iraqi National Guard HQ BAGHDAD, Iraq - A mortar attack on an Iraqi National Guard headquarters north of Baghdad on Tuesday killed four guardsmen and wounded 80 others, the U.S. military said...

World