The BSE Sensex crossed the historic 57,000 mark. After the initial gains, the market closed 214 points down at 57,338 yesterday. The market has rallied by around 4,387 points in the last one month. Many mutual fund investors are seeing eye-popping returns in their portfolios. However, some mutual fund investors are also fearful of a correction. Fund managers believe that investors need to tread with caution at this point in the market.