The Sensex at the Bombay Stock Exchange lost some more ground in afternoon trade, to stand 159 points, or 0.8 percent in negative territory, at 21,096 a short while ago. Earlier in the morning, the Sensex had declined 90 points, or 0.4 percent, to 21,165, as foreign funds and retail investors booked profits, amid weakness the the global bourses. Elsewhere in Asia, stock markets in Japan, China, Taiwan, South Korea, Indonesia, Singapore and Hong Kong had lost between 0.5 percent and 1.4 percent, today, on concerns about the US Federal Reserve, or central bank, tapering its monetary stimulus.The US Dow Jones Industrial Average had ended 0.3 per cent lower in yesterday's trade.The rupee dropped by 28 paise to 61 rupees 32 paise against the dollar in late morning trade. This follows fresh demand for the US currency from banks and importers.The rupee resumed lower at 61 rupees 23 paise per dollar as against yesterday's closing level of 61 rupees 04 paise