New Delhi, April 8 Crude oil prices plunged sharply on Wednesday, falling by 6 per cent to hit their lower circuit level in futures trading, as global benchmarks weakened following the announcement of a two-week ceasefire between the US and Iran.On the Multi Commodity Exchange (MCX), futures for April delivery of crude oil declined by Rs 640, or 6 per cent, to Rs 10,029 per barrel – its lower circuit limit.Similarly, the May contract fell by Rs 565, or 6 per cent, to Rs 8,860 per barrel, also hitting its lower circuit limit due to aggressive selling as easing tensions reduced fears of supply disruptions.Globally, oil prices retreated after the ceasefire announcement between the US and Iran, which is expected to restore supply...