Sensex tumbles nearly 1,200 pts to slip below 80k; Nifty drops 360 pts as heavyweights drag

From the 30-share Sensex pack, Mahindra & Mahindra, Infosys, HCL Technologies, Adani Ports, Bajaj Finance, Tech Mahindra, Titan, Tata Consultancy Services, Reliance Industries and Power Grid were among the laggards