The Sensex at the Bombay Stock Exchange declined 93 points, or 0.6 per cent, to 16,406, within the first few minutes of trade on Wednesday morning, as investors resorted to profit-booking, amid weakness in the other Asian markets. Later, after a brief recovery, the Sensex again lost ground, and stood 139 points, or 0.8 percent in negative territory, at 16,359 in volatile trade, a short while ago. The 30-share Sensex had advanced more than 350 points in the past two trading sessions. Other regional bourses in Japan, China, Taiwan, Indonesia, Singapore, Hong Kong and South Korea were down by between 0.1 percent and 1.2 percent on Wednesday, after credit rating agency, Moody's downgraded Japan's sovereign debt rating. But over in the US, the Dow Jones Industrial Average had spurted nearly 3 per cent, overnight.