U.S. oil prices ended a three-day bull run on Friday, falling as a strong dollar made it more expensive to hold oil positions.
The dollar was at a more than two-week high against a basket of currencies, weighing on greenback-denominated commodities such as oil futures and making fuel imports more expensive for countries using other currencies and potentially hitting demand.
Also on Friday, Baker Hughes reported the number of oil rigs operating in the United States fell by 10 in the last week to a total of 310, marking the eighth straight week of declines. At this time last year, U.S. drillers had 660 rigs on line.
OPEC pumped 32.44 million barrels per day (bpd) in April, it said in a monthly report citing secondary sources, up 188,000 bpd from March. This is the highest since at least 2008, according to a Reuters review of past OPEC reports.
The group signaled the global oil glut may increase this year as surging output from its members makes up for losses from other countries whose production has been hit by low prices.