"WASHINGTON -- Defense Secretary Robert M. Gates has warned in a secret three-page memorandum to top White House officials that the United States does not have an effective long-range policy for dealing with Iran's steady progress toward nuclear capability, according to government officials familiar with the document.

Several officials said the highly classified analysis, written in January to President Obama's national security adviser, Gen. James L. Jones, came in the midst of an intensifying effort inside the Pentagon, the White House and the intelligence agencies to develop new options for Mr. Obama. They include a set of military alternatives, still under development, to be considered should diplomacy and sanctions fail to force Iran to change course.

Officials familiar with the memo's contents would describe only portions dealing with strategy and policy, and not sections that apparently dealt with secret operations against Iran, or how to deal with Persian Gulf allies.

One senior official, who like others spoke on the condition of anonymity because of the sensitive nature of the memo, described the document as "a wake-up call." But White House officials dispute that view, insisting that for 15 months they had been conducting detailed planning for many possible outcomes regarding Iran's nuclear program."