The US government has charged a Netherlands-based oil trading firm with manipulating crude oil prices in the first civil complaint since energy regulators began a new investigation into wrongdoings in energy markets.┬á The Commodity Futures Trading Commission (CFTC) accused Optiver Holding, two of its subsidiaries and three employees with manipulation and attempted manipulation of crude oil, heating oil and gasoline futures on the New York Mercantile Exchange.┬á The CFTC, the governmentÔÇÖs main regulator of commodity markets, said the accused tried to ÔÇ£bang the closeÔ