DUBAI - Saudi Arabia has taken a first step to have Iran reported to the United Nations Security Council, a move that could lead to new sanctions, over an alleged plot to assassinate its ambassador in Washington, Saudi-owned newspapers reported on Sunday."Saudi Arabia's permanent mission to the United Nations... formally requested the United Nations Secretary General notify the Security Council of the heinous conspiracy," the Asharq al-Awsat newspaper reported, citing a statement from the kingdom's UN mission.The US on Tuesday said it had uncovered a plot by two men with links to Iran's security forces to assassinate Adel al-Jubeir by planting a bomb in a Washington restaurant.One of the men, who had allegedly paid a US undercover agent posing as a Mexican drug cartel hit-man to carry out the assassination, has been arrested while the other is in Iran, the United States said.Tehran has denied the charges.