Mumbai:Sensex, Nifty Today: Indian equity benchmark indices, the Sensex and Nifty, opened flat with a cautious undertone, as persistent uncertainty surrounding the US-Iran negotiations continues to weigh on investor sentiment. In the last trading session, the Sensex closed at 78,154.25 and the Nifty 50 at 24,471.70. Meanwhile, shares of Godrej Consumer Products tumbled 10 per cent, hitting the lower circuit in early trade. In early trade, market breadth was negative, with 1,312 stocks declining against 1,557 stocks advancing on the NSE. Shanghai's SSE Composite index was in the green with a drop of 12.42 points or 0.32 per cent.