Oil prices rose a further 2% on Monday, pushing Brent above $70 a barrel , as rhetoric from the United States, Iran and Iraq fanned tensions in the Middle East after the killing of a top Iranian general. The gains extended Friday’s more-than-3% surge after a U.S. air strike in Iraq killed Iranian commander Qassem Soleimani on Friday, heightening concerns that a widening Middle East conflict that could disrupt oil supplies.On Sunday President Trump threatened to impose sanctions on Iraq, the second largest producer among the Organization of the Petroleum Exporting Countries (OPEC), if U.S. troops were forced to withdraw from the country. Baghdad earlier called on American and other foreign troops to leave Iraq.In the United States , U.S. crude stocks fell by their most since June as exports exceeded 4 million barrels per day for the first time in history, the Energy Information Administration said on Friday.