Iran will respond if OPEC members threaten its interests - oil minister

GENEVA (Reuters) - Iran will respond if other OPEC members threaten its interests, Oil Minister Bijan Zanganeh said on Thursday amid rising pressures from Washington to bring Iranian crude sales to zero with the help of Tehran's regional rivals.The United States has demanded that buyers of Iranian oil stop purchases by the start of May or face sanctions, ending six months of waivers that had allowed OPEC member Iran’s eight top customers, most of them in Asia, to import limited volumes. Saudi..