India, Aug. 20 -- Benchmark equity indices Sensex and Nifty closed lower on Wednesday as elevated crude oil prices amid a lack of a diplomatic resolution following the end of the US-Iran ceasefire dented investor sentiment. The expiry of the temporary 60-day US-Iran ceasefire without any meaningful diplomatic breakthrough has renewed concerns over a prolonged disruption to energy supplies, driving crude oil prices higher, an expert said. The 30-share BSE Sensex was down 325.78 points, or 0.42 per cent, to settle at 76,909.68, registering its fourth day of decline. During the day, it dropped 412.57 points, or 0.53 per cent, to 76,822.89. In the last four days, the benchmark has lost 1,170.28 points, or 1.49 per cent. Extending its losses t...