TOKYO (Reuters) - Japan's Nikkei share average fell in a broad sell-off on Wednesday, tracking Wall Street's overnight declines amid worries about slowing growth as hopes for U.S. tariff concessions faded.

As of 0016 GMT, the Nikkei index had fallen 3.1% to 32,010.93. The broader Topix lost 3% to 2,360.32.

The S&P 500 sold off sharply on Tuesday to close below 5,000 points for the first time in almost a year, reversing a strong morning rally as investor hopes faded for any U.S. delays or concessions on tariffs ahead of a midnight deadline. [.N]

In Japan, technology stocks led the decline, with chip-testing equipment maker Advantest ( ADTTF ) down 9% and chip-making equipment maker Tokyo Electron ( TOELF ) down 4.85%.

Technology investor SoftBank Group fell 5.96%.