The Nikkei stock index plunged nearly 3 percent Thursday, closing at an eight-month low as fears of a global economic slowdown intensified following U.S. President Donald Trump's announcement of reciprocal tariffs.The U.S. dollar briefly fell to a three-week low in the upper 146 yen range in Tokyo as investors bought the yen, seen as a safe-haven asset, amid concern over the economic outlook following the latest U.S. tariff measure, dealers said.The 225-issue Nikkei Stock Average dropped 989.94 points, or 2.77 percent, from Wednesday to 34,735.93, its lowest closing since Aug. 6, after brie…READ FULL ARTICLE