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: Ten Sistani Supporters Killed in Iraq's Najaf  NAJAF, Iraq (Reuters) - At least 10 supporters of Iraq's  top Shi'ite cleric were shot dead in Najaf Thursday when gunmen  opened fire at police who were trying to control the crowd,  prompting the police to return fire, witnesses said.

World