Yahoo News UK | Factbox: Sanctions on Iran's oil sector Reuters Americans are prohibited from trading directly or indirectly with Iran's oil sector, the government of Iran and individuals connected to the oil sector or in any financing of it. U.S. companies are also prevented from investing in Iran's oil and gas ... Oil extends losses as deadline for Iran nuclear deal looms Why Saudis Could Let Crude Oil Drop to $25 Oil prices fall amid speculation about Iran deal |