It was Monday mayhem for the Indian bourses, and the worst day in history as BSE Sensex and NSE Nifty saw a free fall. Once again trading came to a halt for 45 minutes as the Sensex hit a lower circuit limit of 10 per cent. However, the sell-off continued even after trading resumed. The rising COVID-19 cases, across the globe as well as in India, has spooked investors, as the mood of the markets continued to be on negative side as the virus spread has deepened.