Israel has been attacking Iranian military and nuclear sites for days to, it says, stop Tehran from building a bomb.

Israel's escalating conflict with Iran over its increased nuclear as brought up speculation about the possible use of one of America's powerful weapons in the conflict.

The GBU-57—also called the Massive Ordnance Penetrator—is a 30,000-pound bomb designed to plummet through 200 feet of mountain rock before exploding. Analysts say the U.S. “bunker buster” has the best chance of getting through to targets like Iran’s Fordow uranium-enrichment facility,