Heavy selling in IT stocks dragged the Sensex at the Bombay Stock Exchange down 160 points, or 0.8 per cent, to 19,537, in early trade, on Friday morning, after IT bellwether, Infosys reported a lower-than-expected 14 per cent increase in its fourth quarter net profit. After plunging more than 330 points at one stage, the Sensex stood 266 points, or 1.4 percent in negative territory, at 19,431, in afternoon deals, a short while ago. The Infosys stock was down 8.5 percent.Other key Asian markets also edged lower, with the benchmark indices in China, Hong Kong, South Korea, Japan, Singapore and Taiwan losing between 0.2 percent and 0.5 percent, as China's consumer inflation accelerated in March, and on disappointing US economic data.