And the United States, which is working on new bunker-busting nuclear bombs, wants sanctions against North Korea and Iran.

NPR: Weak Prospects for Nuclear Nonproliferation Efforts

Kerry said in the debate that "It doesn't make sense" for "the United States to pursue a new set of nuclear weapons" including "bunker-busting" ones.

CENTERFORSECURITYPOLICY: Kerry's nuclear nonsense

It took a year to muster an Arab counter-strike, but on October 24th a squadron of Lebanese chefs cooked up a bunker-busting bowlful that weighed in at over 2, 000kg.

ECONOMIST: A good-humoured war over food

On March 19, 2003, U.S. missiles and bunker-busting bombs dropped by air struck targets inside Iraq, paving the way for a ground invasion by U.S.-led forces the next day that eventually overthrew President Saddam Hussein's regime on April 9.

WSJ: Wave of Deadly Attacks Hits Baghdad

Perhaps it was a bunker-busting bomb.

CNN: Holmes: Iraqi capital still tense