TOKYO (Kyodo) -- The Nikkei stock index tumbled over 5 percent early Friday after Wall Street plunged overnight on concern about a widening trade war between the United States and China.

In the first 15 minutes of trading, the 225-issue Nikkei Stock Average fell 1,843.50 points, or 5.33 percent, from Thursday to 32,765.50. The broader Topix index was down 124.41 points, or 4.90 percent, at 2,414.99.

All industry sectors lost ground on the top-tier Prime Market, with decliners led by oil and coal product, electric appliance, and nonferrous metal issues.

The U.S. dollar hit a six-month low in the upper 142 yen range in Tokyo, as the Japanese currency, seen as a safe-haven asset, was sought amid growing fears of a global economic slowdown triggered by U.S. tariffs, dealers said.

At 9 a.m., the dollar fetched 143.75-77 yen compared with 144.38-48 yen in New York and 146.26-28 yen in Tokyo at 5 p.m. Thursday.

The euro was quoted at $1.1256-1260 and 161.79-84 yen against $1.1194-1204 and 161.89-99 yen in New York and $1.1026-1028 and 161.27-31 yen in Tokyo late Thursday afternoon.