Iran announced on Saturday that its military "unintentionally" shot down Ukraine International Airlines Flight 752.
Under international law, the investigation into Ukrainian flight PS752 should be held by Iran.
"America, this is an emergency. If we spiral into war with Iran, millions could die."
CNN's Barbara Starr reports the B-52s will be "available for operations against Iran if ordered."
An adviser to Iran's president posted what appears to be a warning of a revenge attack on a Trump property.
The bizarre outrage comes after George Lopez joked about accepting a bounty on Trump's head at "half the price."
If Tehran avenges the killing of Soleimani, 52 sites important to Iran and its culture will be wiped out.
War hawks who have had their crosshairs trained on Iran for years enthusiastically celebrated Trump's decision.
The U.S. military conducted air strikes in Iraq and Syria against the five facilities controlled by the Kataib Hezbollah militia group.