The Sensex at the Bombay Stock Exchange fell 107 points, or 0.6 per cent, to slip below the 19,000 level, at 18,901 in opening trade, this morning. Later, after recovering partially, the Sensex stood 63 points, or 0.3 percent in the red, at 18,945 in afternoon deals, amid volatile trade, a short while ago. The 30-share Sensex had had lost over 560 points in the previous three trading sessions.Stock markets in China, Hong Kong, Singapore, South Korea, and Taiwan were trading mixed, today. Wall Street's Dow Jones Industrial Averge had ended flat, yesterday.