Iran moves to cooperate in nuclear arms probe

The U.N. nuclear agency said on Sunday that Iran had agreed to start addressing suspicions that it may have worked on designing an atomic weapon, a potential breakthrough in a long-stalled investigation into Tehran's atomic activities. The development - although limited for now - marked a step forward in an international push to settle a decade-old dispute over Iran's nuclear program. Tehran says this is peaceful, while the West fears that Iran wants to develop atomic arms.

Background:

Iran agrees to more steps to ease worries over nuclear program [CNN]