Speaking to the UN Security Council, US spokeswoman Kelly Kraft said Iran was responsible for the attack on Saudi Arabia.
Gold is slightly declining, awaiting the outcome of the FOMC meeting, which will be held September 17-18.
Oil prices are declining gradually after a solid gap of the quotes to the upside.
On Monday, EUR / USD is trading in a very narrow range amid the absence of important news in the US and EU economic calendar.
Gold opens a new trading week with upside gap after attacks on Saudi refineries and the publication of weak macroeconomic data from China.