The Sensex at the Bombay Stock Exchange plunged 245 points, or 1.4 percent, to 17,244 in opening trade, this morning. Later, the Sensex lost some more ground, and stood 283 points, or 1.6 per cent in the red, at 17,206 in afternoon deals, a short while ago. The market fell on heavy selling by funds and retail investors, after IT major, Infosys issued a lower-than-expected revenue guidance for the current fiscal, dragging down the IT index by more than 5 percent. Investor sentiment was also hit by declining regional bourses. Other Asian markets in Japan, Hong Kong, Indonesia, Taiwan, South Korea and Singapore were down by between 0.3 percent and 2.2 percent, today, after a surprise rate cut in South Korea, and lack of central bank policy action from Japan. Over in the US, the Dow Jones Industrial Average had ended 0.4 per cent lower in yesterday's trade.