Continuing its long losing streak, the Sensex at the Bombay Stock Exchange fell 156 points, or 0.8 per cent, to 18,379, this morning, on sustained selling by investors, after the Reserve Bank's unexpectedly sharp hike in key policy rates. Remaining weak, the Sensex stood 120 points, or 0.6 percent in negative territory, at 18,415 in afternoon deals, a short while ago. The Sensex has already lost well over 1,000 points in the last seven trading sessions. Other Asian markets in China, South Korea, Indonesia, Hong Kong and Singapore were down by between 0.5 percent and 2 percent, today.