US crude futures fell $5.57, or 5.7%, to $91.15/bpd as traders assessed a potential peace agreement between the US and Iran.

- U.S. crude futures fell more than 6 percent in early Asian trading on Tuesday after the Nikkei newspaper reported that the United States and Iran were discussing a plan to reopen the Strait of Hormuz, some 30 days after the two countries reached an agreement to end hostilities.

By 22:05 GMT, U.S. West Texas Intermediate crude had fallen $5.90, or 6.1 percent, to $90.73 a barrel.