(Ebrahim Noroozi | AP) Protesters hold up posters of Gen. Qassem Soleimani while mourning during a demonstration over the U.S. airstrike in Iraq that killed Iranian Revolutionary Guard Gen. Qassem Soleimani, in Tehran, Iran, Saturday Jan. 4, 2020. Iran has vowed "harsh retaliation" for the U.S. airstrike near Baghdad's airport that killed Tehran's top general and the architect of its interventions across the Middle East, as tensions soared in the wake of the targeted killing.