An Israeli strike hit Iran's state broadcaster on Monday while the head of the U.N. nuclear watchdog indicated extensive damage to Iran's biggest uranium enrichment plant and Iran called on the U.S. to force a ceasefire in the aerial war.

Iran has two known underground nuclear enrichment sites, the one Israel attacked on the first day of its assault at Natanz, and another at Fordo. Both sit south of Tehran in central Iran, but Fordo has long been the Iranian nuclear facility of most concern to international monitors and experts.

Israel strikes Iran's nuclear facilities, but an expert cautions that the heavily protected Fordow site remains a dangerous threat that only U.S. military capabilities can neutralize.

Israel has escalated its bombardment of Iranian cities, including Tehran's state television headquarters; Iranian missiles have struck Tel Aviv.

The U.S. is considering targeting Iran's uranium enrichment facility at Fordo, five sources familiar with the matter told CBS News.

An Israeli official said that "there's never a 100 percent guarantee," but "a nuclear disaster" should "not happen."

If the U.S. decides to support Israel more directly in its attack on Iran, one option for Washington would be to provide the “bunker-buster” bombs believed necessary to significantly damage the Fordo nuclear fuel enrichment plant,

Americans strongly support preventing Iran from acquiring nuclear weapons according to Reagan Institute poll, as Trump reiterates stance amid Israel-Iran conflict

Kyle Bass, Hayman Capital Management founder and CIO, joins 'Squawk Box' to discuss the latest developments in the Israel-Iran conflict, America's role in the conflict, and more.