From Voice of America:
The Pentagon says a massive 13,600-kilogram bomb capable of penetrating deep underground facilities should be deployable in the coming months.
Pentagon spokesman Geoff Morrell has told reporters Wednesday the "Massive Ordinance Penetrator" (MOP) is designed to defeat "hardened facilities" that are used by "hostile states to protect weapons of mass destruction."
Morrell declined to say whether deployment of the new weapon is linked to International concern about Iran's nuclear program. He told reporters that any efforts to "speculate about possible targets" are unhelpful.
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More News On The Development of The "Massive Ordinance Penetrator" (MOP)
US Advances Deployment of 'Bunker Buster' Bomb -- Voice of America
US 'bunker buster' bomb to be ready soon: Pentagon -- AFP
New Bomb Has ‘Important Capability,’ DoD Official Says -- U.S. Department of Defense
New Penetrator Bomb Has 'Important Capability,' DoD Official Says -- Australia.to News
Iran threatened by U.S. buster bomb -- UPI
U.S. may be preparing to bomb Iran nuclear sites – report -- Washington TV