[Crude Oil Dips Briefly, Iran Conflict Mediator Expected to Hold Talks with U.S. and Iran on Monday or Tuesday] BlockBeats News, September 28, according to Reuters citing an official familiar with the negotiations, the mediator is expected to hold separate talks with the U.S. and Iran on Monday or Tuesday. The Iranian Foreign Minister and the Qatari mediator will remain in the U.S. Following the announcement, WTI and Brent crude oil prices briefly dipped by approximately $1, trading at $93.92 per barrel and $99.82 per barrel, respectively.