It's still un confirmed. I read a bit about it on antimullah.com but it seems there was a big blast in kennar a potential nuke test site in iran. It was an explosion that was felt up to 100 kilometers away according to the report.

The hilarious part is iran said it was a UFO that crashed and exploded. Now there's a cover story for an atomic bomb if I ever heard one. Gotta see if anyone else has anything on this. Antimullahs sources include iranian dissidents through emails and phone calls. So he's looking for more info there too.