Iran's supreme leader vows revenge after US kills top general in airstrike
S forces launched a drone strike that killed Iranian General Qasem Soleimani. The Iranian general had just arrived at Baghdad's airport before the deadly airstrike. The airstrike comes as Iran-US tensions reach a boiling point. US officials believe Soleimani was behind training and deploying Iranian-backed proxy fighters in Yemen, Lebanon and Iraq. The day before the airstrike, U.S. Defense Secretary Mark Esper warned of preemptive strikes against Iranian targets in Iraq.