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By Benjamin Kang Lim and Ben Blanchard BEIJING (Reuters) - China has put Zhou Yongkang, one of the most powerful politicians of the last decade, under virtual house arrest while the ruling Communist Party investigates accusations of corruption against him, several sources said on Wednesday. He was the domestic security tsar and a member of the party's Politburo Standing Committee - the pinnacle of power in the country - when he retired last year. Chinese President Xi Jinping ordered a special task force formed in late November or early December to look into several accusations brought against Zhou by political rivals, sources with ties to the leadership told Reuters, requesting anonymity to avoid repercussions for discussing secretive elite politics. "Zhou Yongkang's freedom has been restricted.