QE caution keeps euro zone bond yields near highs before ECB

LONDON (Reuters) - Euro zone bond yields touched their highest since early August on Wednesday amid doubts over whether the European Central Bank will announce a fresh round of asset purchases this week.Analysts cited a report late Tuesday that the ECB may delay quantitative easing and tie it to upcoming economic data as a reason for the latest sell-off in debt markets.Many ECB policy-makers favour resuming purchases of bonds, but opposition from some northern European countries is complicating..