U.S. Finds Iran Halted Its Nuclear Arms Effort in 2003

Stephen Crowley/The New York Times

Stephen J. Hadley, the national security adviser, discussed Iran’s nuclear program at the White House.

By MARK MAZZETTI

 WASHINGTON, Dec. 3 — A new assessment by American intelligence agencies released Monday concludes that Iran halted its nuclear weapons program in 2003 and that the program remains frozen, contradicting a judgment two years ago that Tehran was working relentlessly toward building a nuclear bomb.

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