Red Crescent workers check the debris from the Ukraine International Airlines plane, that crashed after take-off from Iran's Imam Khomeini airport, on the outskirts of Tehran, Iran January 8, 2020. Nazanin Tabatabaee/WANA (West Asia News Agency) via REUTERS
A Ukraine airliner that crashed in Iran, killing all 176 people aboard, was most likely brought down accidentally by Iranian air defenses, U.S. officials said on Thursday, as President Donald Trump said he had a terrible feeling about the disaster.