In the domestic stock markets, the Sensex tumbled below the 26,000-mark, amid a global market slide, today, while the rupee weakened modestly against the dollar. Giving up small initial gains, the Sensex at the Bombay Stock Exchange finally closed with a big loss of 461 points, or 1.8 percent, at 25,603, amid the monthly expiry in the derivatives segment. The Nifty at the National Stock Exchange plunged 133 points, to 7,847. Other key Asian markets also ended in the red, after the Bank of Japan maintained status quo in its monetary policy. So the Japanese market sank 3.6 percent, while the bourses in China, South Korea and Singapore lost between 0.3 percent and 0.7 percent. Major European bourses in the UK, France and Germany fell over 0.5 percent, each. And at the forex market, the rupee depreciated 8 paise, to 66.52 against the dollar.