US crude futures rose slightly on Friday but were on track for their first weekly drop in seven weeks as supply concerns eased, and investors focused on the outcome of US-Iran nuclear talks in Oman later in the day. Brent crude futures rose 25 cents, or 0.4%, to $67.80 a barrel at 0353 GMT, while the US West Texas Intermediate crude was also up 25 cents, or 0.4%, at $63.54 a barrel. The benc