U.S. crude oil futures ended lower on Friday as the dollar's rebound directed investment flow away from commodities, at least for the moment, and as traders took pre-weekend profits, snapping a three-day rally.

New York Mercantile Exchange Nat gas futures trimmed early losses but ended lower Friday, as weaker crude and concerns about bearish fundamentals could not support the prices.

The Organization of the Petroleum Exporting Countries, in a monthly report on Friday, cut its forecast for world oil demand further, but said the worst appeared to be over for the market. OPEC said demand this year would contract by 1.62 million barrels per day. It previously expected a decline of 1.57 million bpd.

Iraq has raised the official selling price of its crude for July 2009, an official at the State Oil Marketing Organization said on Sunday.

Crude oil is likely to witness some selling pressure during the day due to demand concerns and stronger dollar, trend for the day remains down. We remain fundamentally bullish in Nat Gas.