Oil prices ticked up on Tuesday on concerns about supply, with Iran set to reject a US nuclear deal proposal that would be key to easing sanctions on the major oil producer, while weakness in the dollar also supported prices.
Brent crude futures gained 12 cents, or 0.19 per cent, to $64.75 a barrel by 0627 GMT. US West Texas Intermediate crude was up 20 cents, or 0.32 per cent,
