AMSTERDAM (AP) — Royal Dutch Shell Plc said Wednesday it has stopped selling gasoline to Iran, the latest company to cease business with a country that is increasingly targeted by U.S.-encouraged sanctions. ""We do not currently sell any gasoline to Iran,"" said Rayiner Winzenried, a Shell spokesman in The Hague. He declined to say when the sales to Tehran were halted or to relate the move to the call for tighter sanctions. Reports say the Dutch-Swiss traders Vitol Holding BV and Trafigura also have halted sales to Iran, as has Glencore International AG, another Swiss-based commodities trader. The United States and its Western allies have been pushing for another round of UN sanctions to force Iran freeze its uranium enrichment program. Iran has repeatedly said its nuclear program is designed for peaceful purposes.