June 21 (UPI) -- The U.S. military has moved several B-2 Spirit stealth bombers and refueling aircraft to Guam, which may be a precursor to aerial strikes against Iran's most important nuclear facility.

The deployment comes as President Donald Trump has announced a two-week pause to allow for potential cease-fire negotiations to end the hostilities between Israel and Iran.

Trump also has said the U.S. knows where Iranian Supreme Leader Ali Khamenei is sheltering but won't target him with a military strike for the time being.

Israel has gained aerial superiority in the skies over Iran, but Israel's conventional munitions can't effectively penetrate the Fordow Fuel Enrichment Plant site in a mountainous area in central Iran, according to reports.

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