The Benchmark domestic equity indices, Sensex and Nifty, were trading over four per cent down in the afternoon trade today, mirroring intense sell-off across global markets. The 30-share BSE Sensex nosedived 3,245 points to 72,120, and the NSE Nifty50 plummeted 1,037 points to 21,868, when reports last came in. This decline is triggered by escalating trade tensions and mounting recession concerns in the US.