Tokyo stocks broke a three-day winning streak Tuesday as investors locked in recent gains amid concerns over tensions in the Middle East, while a stronger yen versus the U.S. dollar weighed on exporters. The 225-issue Nikkei Stock Average ended down 395.20 points, or 1.00 percent, from Monday at 38,937.54. The broader Topix index finished 40.24 points, or 1.47 percent, lower at 2,699.15. On the top-tier Prime Market, decliners were led by securities house, wholesale trade and transportation equipment issues. The dollar briefly weakened to the mid-147 yen range in Tokyo as traders sought the Ja…