Tokyo stocks open lower on U.S. economy concerns, stronger yen

Tokyo stocks opened lower Tuesday as weak U.S. manufacturing data for July fueled concerns over the world's largest economy, while a stronger yen weighed on some export-related issues. In the first 15 minutes of trading, the 225-issue Nikkei Stock Average fell 262.79 points, or 0.94 percent, from Monday to 27,730.56. The broader Topix index was down 20.99 points, or 1.07 percent, at 1,939.12. On the top-tier Prime Market, decliners were led by oil and coal product, mining, and pharmaceutical issues. At 9 a.m., the dollar fetched 131.37-40 yen compared with 131.55-65 yen in New York and 132.55-...