A man walks by an electronic stock board of a securities firm showing Japan's Nikkei 225 index that dropped 61.99 points to close at 8,807.38 for the day in Tokyo Tuesday, Sept. 11, 2012. Asian stock markets retreated Tuesday as investors sought safety ahead of critical events this week that will test Europe's willingness to unite in order to deal with a major debt crisis. (AP Photo/Koji Sasahara)
