Equity benchmark indices snapped their five-day gaining streak as the recently agreed upon US-Iran ceasefire came under threat. The BSE Sensex fell as much as 938.55 points, or 1.21 per cent, to hit an intraday low of 76,624.35. Likewise, the NSE Nifty 50 tumbled up to 237.90 points, or 1 per cent, to the day’s low at 23,759.45.