The plot thickened on Thursday afternoon hours after a building at a nuclear facility looked to have blown up in Iran. Reports of a "explosive device planted," and an early warning, as well as a dissident group taking responsibility now adds to questions and concerns about what happened at the sensitive site.

The building affected by some kind of an explosion is located at the Natanz nuclear enrichment facility. Iran had alerted the world to the incident in the morning of July 2 and even took state media for a tour to show that while there had been some kind of incident, the nuclear facility was not in danger. It is the third mysterious explosion in a week and has led to many questions.