Mumbai: Rise in food inflation and a massive sell-off by domestic and foreign investors have pulled down the Sensex in the mid-session by 400 points on Thursday.

The Bombay Stock Exchange benchmark, which opened in the negative zone, was down by 402.54 points or 2.21 per cent, at 17,775.79 at 2:10 pm (IST).

Similarly, the broad-based National Stock Exchange index Nifty was also trading lower by 132.60 points, or 2.44 per cent, at 5,304.75.

Brokers said the trading sentiment was extremely bearish, taking cues from a series of negative events like rise in inflation, surging crude oil prices in global markets and the spiraling crisis in Libya.

In addition, weakness in equity markets around the globe tempered the mood at home.