New York Times: Senior staff members of the United Nations nuclear agency have concluded in a confidential analysis that Iran has acquired “sufficient information to be able to design and produce a workable” atom bomb.

Reuters: The head of the U.N. nuclear agency arrived in Iran on Saturday for talks on a timetable for inspectors to visit a newly disclosed unfinished nuclear enrichment plant, state radio reported.

AP: Congress is poised to act swiftly on new penalties against Iran if international talks on Tehran's nuclear program show signs of faltering.

Wall Street Journal: Once the world's self-proclaimed international mediator, France is now trying its hand at pit-bull diplomacy with Iran.

Reuters: The head of the U.N. nuclear watchdog will head to Iran this weekend to pin down an Iranian pledge, made at talks with big powers on Thursday, to open a newly revealed uranium enrichment site to inspections.

Reuters: Talks between Iran and six world powers in Geneva on Thursday were a first step, but Tehran must show it is willing to do more if it is to win the confidence of the West, a German foreign ministry spokesman said.

Wall Street Journal: The U.S. has begun to ratchet up enforcement of existing sanctions on Iran, including cracking down on illegal exports of American products, even as it threatens fresh economic restrictions if Iran doesn't stop enriching nuclear material.

Reuters: Iran appeared flexible enough at talks with six major powers to mute immediate calls for tougher sanctions, but signaled no retreat from nuclear goals it says are only to produce energy, not atom bombs as the West suspects.