The Nikkei Stock Average extended its decline on the Tokyo Stock Exchange on September 10, briefly losing more than 900 points and falling below 65,000 as weaker U.S. equities, higher crude oil futures and rising U.S. long-term interest rates weighed on sentiment. The morning session ended at 64,597.46, down 545.32 points, while TOPIX fell 13.75 points to 4,032.89. Selling spread across many sectors despite early support from artificial intelligence and semiconductor shares. Investors also remained cautious ahead of the U.S. August Producer Price Index (PPI), the September 11 major SQ calculation date and policy meetings by Japan's and the U.S. central banks. Okachi Securities investment information office head Hiroyasu Mori said September's historically weak market pattern was unfolding and that the market could remain directionless.