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Reuters - Libyan tanks and warplanes intensified their offensive against rebels on Tuesday, as the United States stressed that any no-fly zone to hobble Muammar Gaddafi's forces had to have global backing.<br style="clear: both;" /><p><strong>Read more:</strong> <a class="rssreadon" rel="external" title="Gaddafi's forces step up fightback; U.S. mulls action   (Reuters)" href="http://us.rd.yahoo.com/dailynews/rss/topstories/*http%3A//news.yahoo.com/s/nm/20110309/ts_nm/us_libya" target="_blank">http://us.rd.yahoo.com/dailynews/rss/topstories/*http%3A//news.yahoo.com/s/nm/20110309/ts_nm/us_libya</a></p>