Oil prices dipped on Monday after a rising rig count in the United States pointed to higher production there, but markets held near their highest in over three years and remained set for a second straight month of gains. A rainbow is seen over a pumpjack during sunset outside Scheibenhard, near Strasbourg, France, October 6, 2017. REUTERS/Christian Hartmann Oil prices were supported by supply concerns amid prospects that the United States could reimpose sanctions on Iran, while OPEC-led producers continue to withhold output. Brent crude futures LCOc1, the international benchmark, had dipped 50 cents, or 0.7 percent, to $74.14 a barrel by 0633 GMT. Prices climbed as high as $75.47 last week, levels not seen since November 2014. U.S. West Texas Intermediate (WTI) crude futures CLc1 were at $67.82 a barrel, down 28 cents, or about 0.4 percent, from their last settlement. “Oil prices are hanging […]