A man looks at an electronic stock indicator of a securities firm in Tokyo, on Tuesday. Shares tumbled in Asia on Tuesday after a wild day for U.S. markets that resulted in the biggest drop in the Dow Jones industrial average in six and a half years.

A man looks at an electronic stock indicator of a securities firm in Tokyo, on Tuesday. Shares tumbled in Asia on Tuesday after a wild day for U.S. markets that resulted in the biggest drop in the Dow Jones industrial average in six and a half years.