The BSE Sensex cracked below the 34,000-mark by plunging about 1,275 points in opening trade today. Extending its falling streak for the sixth straight session, the 30-share index fell 3.66 per cent, to 33,482. A short while ago it was trading at 33,938 loosing 820. The index had lost 1,526 points in the previous five sessions after its remarkable over 2,200-point gain in January month. Also, the broader NSE Nifty cracked below 10,300-mark by falling 390 points, or 3.65 per cent to 10,276. It was at 10,439 losing 226 points. The rupee also dropped by 29 paise to trade at 64.36 against the US dollar on frenetic dollar demand from importers and banks.