UNITED NATIONS – Saudi Arabia is asking that the alleged Iranian plot to assassinate the Saudi ambassador to the U.S. be brought to the U.N. Security Council.

But Saudi Arabia’s U.N. Ambassador Abdallah Y. Al-Mouallimi did not say what action, if any, his government wants the U.N.’s most powerful body to take.

The council has already imposed four rounds of sanctions against Iran over its disputed nuclear program.

In a letter to Secretary-General Ban Ki-moon obtained Monday by The Associated Press, Saudi Arabia’s Al-Mouallimi called the plot not only “a heinous crime” but “a gross violation” of international treaties including those to protect diplomats.

Two men, including a member of the Iranian special foreign actions unit known as the Quds Force, have been charged in a U.S. federal court in New York with conspiring to kill Saudi Ambassador Adel al-Jubeir. The alleged plot increased tensions between the Middle East’s Sunni power, Saudi Arabia, and the Shiite powerhouse, Iran.

Al-Mouallimi said the Saudi government expressed “deep concern and outrage at this plot” and asked the secretary-general “to bring this matter to the attention of the Security Council.”

Ban told reporters in Geneva earlier Monday that he forwarded the Saudi letter, along with letters from the U.S. and Iran which were made public last week, to the Security Council.

Iran has rejected the allegations of government involvement in the plot, a view reiterated Monday by President Mahmoud Ahmadinejad. He claimed the U.S. was accusing Iran of involvement in a “terror plot” to strengthen international sanctions against the Islamic Republic and divert attention from economic problems in the U.S

In his letter to Ban, Iran’s U.N. Ambassador Mohammad Khazee stressed Iran’s condemnation of terrorism and accused U.S. authorities of carrying out “a well-thought evil plot in line with their anti-Iranian policy to divert attention from the current economic and social problems at home and the popular revolutions and protests against the U.S.’s long-supported dictatorial regimes abroad.”

U.S. Secretary of State Hillary Clinton hinted strongly last week that the Obama administration wants further action from the Security Council.