Euro zone debt worries weigh on European shares By: Reuters: Company News May 09, 2011 at 05:03 AM EDT * For up-to-the-minute market news, click on [STXNEWS/EU] Read More >> Related Stocks: Banco Bilbao Viscaya Argentaria S.A. ADR Birchcliff Energy CNA Financial Corp HSBC Holdings Plc ADR Rio Tinto Plc ADR