Oil prices rose on Thursday after the United States issued new Iran-related sanctions and renewed tensions in the Middle East countered strength in the dollar. Brent crude futures settled up $1.22, or 1.72 per cent, at $72 a barrel. The US West Texas Intermediate crude (WTI) contract for April expired on Thursday, and settled up $1.10 or 1.64pc at $68.26. The more actively traded WTI May