Confidential intelligence documents obtained by The Times show that Iran is working on testing a key final component of a nuclear bomb.

The notes, from Iran’s most sensitive military nuclear project, describe a four-year plan to test a neutron initiator, the component of a nuclear bomb that triggers an explosion. Foreign intelligence agencies date them to early 2007, four years after Iran was thought to have suspended its weapons programme. Read the full story

CAIRO, Egypt — An award-winning Iranian nuclear scientist traveled to Saudi Arabia earlier this year to perform a religious pilgrimage. He never returned.

Shahram Amiri’s mysterious disappearance is turning into a Middle Eastern whodunit involving nuclear secrets and political intrigue, with a new round of accusations emerging this week and the U.S. government still refusing to comment. Read the full story

The State Department said it would meet one-to-one with Pyongyang negotiators in an effort to persuade the reclusive Stalinist state to return to multilateral talks on dismantling its nuclear weapons programme.

Washington has also accepted a vague Iranian offer of talks on broad national security issues, even though Tehran refused to discuss its illicit atomic operations.

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