Iran's most fortified nuclear facility is buried deep inside a mountain. Only the U.S. has the 30,000-pound bombs — "bunker busters" — capable of reaching it. And that option revolves around ...

So far, strikes on Iran's facilities have created limited chemical and radiological hazards. Experts say that's not likely to change even if the U.S. uses a big bomb.

If the U. S. does drop a powerful "bunker buster" bomb on a suspected underground nuclear weapons site in Iran, experts in radiation hazards see little risk of widespread contamination. The site in ...

If the U.S. does drop a powerful "bunker buster" bomb on a suspected underground nuclear weapons site in Iran, experts in radiation hazards see little risk of widespread contamination. The site in ...