Futures are lower as oil prices reach levels not seen since May amid halting efforts to bring the U.S. and Iran back to the negotiation table.

Futures for the S&P 500 fell 0.3% Friday, while Dow Jones futures slid 0.6%. Nasdaq futures dipped 0.1%.

Brent crude, the international standard, rose 1.6% to $114.92 per barrel on Friday. U.S. benchmark crude oil jumped 1.8% to $101.22 per barrel.

Gasoline prices in the U.S. are rising again. The national average for a gallon of regular gas rose 2 cents to $4.29 Friday, according to the AAA, compared with $3.07 a gallon a year ago.

Higher oil prices have weighed on stocks.…