Crude prices fell in a see-saw session on Friday, retreating after early gains as it looked likely that U.S. allies would push to maintain a deal with Iran, which could keep that country’s crude exports on global markets. In another sign global supplies could rise further, data in the afternoon showed U.S. crude producers added 10 rigs in the latest week. Crude prices remained just below multi-year highs, with Brent on track for a weekly 2.8 percent gain and U.S. crude a 1.2 percent weekly rise. “It’s the same witches brew of bullish stuff: Iran, Venezuela, the lack of alacrity by Saudi Arabia to bring more oil onto the market,” said John Kilduff, partner at Again Capital in New York. […]