US Gives Iran Until March to Cooperate on Nukes

Or issue will be sent to United Nations Security Council

The United States set a March deadline on Thursday for Iran to start cooperating in substance with a U.N. nuclear agency investigation, warning Tehran the issue may otherwise be referred to the U.N. Security Council.

The comments by U.S. diplomat Robert Wood to the board of the International Atomic Energy Agency signaled Washington's growing frustration at a lack of progress in the IAEA's inquiry into possible military dimensions to Tehran's nuclear program.

Iran - which was first reported to the U.N. Security Council over its nuclear program by the IAEA's 35-nation board in 2006 and then was hit by U.N. sanctions - rejects suspicions it is on a covert quest for atomic bomb capability.