Oil prices softened on Tuesday, with markets weighing reports of mediation efforts between the US and Iran against an exchange of fresh attacks between the two and threats of a naval blockade of Saudi Arabia by Yemen’s Houthis. Brent crude futures eased 35 cents, or 0.4%, to $88.87 per barrel by 0052 GMT, while US West Texas Intermediate crude for September delivery was steady at $82.47 a ba