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: U.S. Forces Say Rebels Trapped in Southern Falluja  FALLUJA, Iraq (Reuters) - U.S.-led forces have trapped  insurgents in southern Falluja, Marines said on Friday, the  fourth day of an assault that has killed "hundreds" of rebels.  Eighteen American and five Iraqi troops have also died.

World