President Barack Obama on Tuesday, October 9 signed an executive order tightening sanctions on Iran over its nuclear program, the Associated Press reported. The order implements a new Iran sanctions law enacted in August. White House National Security Council spokesman Tommy Vietor says stepped up sanction aimed at Iran have — in his words — “produced profound and demonstrable results.” The Iran Threat Reduction and Syria Human Rights Act expands the list of those targeted by Iran sanctions, closes loopholes and enhances penalties. Those targeted include anyone who works in Iran’s petroleum sectors or provides goods, services, infrastructure, or technology to Iran’s oil and natural gas sector, those who insure or re-insure investments in Iran’s oil sector and those who transport refined petroleum to Iran. It also targets Iranian and Syrian officials involved in human-rights abuses.