How do they know this? Seriously, does Iran give Panetta get weekly updates? Do they just fly a drone over and take a picture of the developing bomb? Do they collect this info through espionage and then tell everyone just because the info happens to back their ambitions? Or are all of the above BS and they're just making this up as they go. I honestly cannot see how any except the last of those could be true.
Saudis warns U.S. that 9/11 responsibility law would erode investor confidence in America (Reuters)
from the article: U.S. Defense Secretary: Iran could get nuclear bomb within a year