A general view shows a building with an anti-U.S. mural in Tehran, Iran January 3, 2020. Nazanin Tabatabaee/WANA (West Asia News Agency) via REUTERS

A demonstrator holds the picture of Qassem Soleimani during a protest in Tehran, Iran January 3, 2020. WANA (West Asia News Agency)/Nazanin Tabatabaee via REUTERS

Iranian demonstrators react during a protest against the killing of Soleimani in front of the United Nations office in Tehran, Iran January 3, 2020. Nazanin Tabatabaee/WANA (West Asia News Agency) via REUTERS

A demonstrator holds a picture of Supreme Leader Ayatollah Ali Khamenei with Soleimani in Tehran, Iran January 3, 2020. WANA (West Asia News Agency)/Nazanin Tabatabaee via REUTERS

A damaged car, claimed to belong to Qassem Soleimani and Abu Mahdi al Muhandis, is seen near Baghdad International Airport, Iraq January 3, 2020. Iran promised vengeance after a U.S. air strike in Baghdad killed Soleimani, Tehran's most prominent military commander and the architect of its growing influence in the Middle East. Soleimani, a 62-year-old general who headed the elite Quds Force, was regarded as the second most powerful figure in Iran after Supreme Leader Ayatollah Ali Khamenei. The attack also killed top Iraqi militia commander Abu Mahdi al-Muhandis, an adviser to Soleimani. Ahmad Al Mukhtar/via REUTERS

Iranian policemen hold pictures of Soleimani, during a protest in front of the United Nations office in Tehran, Iran January 3, 2020. WANA (West Asia News Agency)/Nazanin Tabatabaee via REUTERS

A U.S. Marine with 2nd Battalion, 7th Marines supervises his squad as they provide over watch security at the U.S. embassy compound in Baghdad, Iraq, January 3, 2020. U.S. Marine Corps/Sgt. Kyle C. Talbot/Handout via REUTERS

Burning debris is seen on a road near Baghdad International Airport in Iraq, January 3, 2020. Iraqi Security Media Cell via REUTERS

Demonstrators attend a protest against the killing of Soleimani in Tehran, Iran January 3, 2020. WANA (West Asia News Agency)/Nazanin Tabatabaee via REUTERS

Iranian demonstrators react during a protest against the killing of Soleimani in front of the United Nations office in Tehran, Iran January 3, 2020. WANA (West Asia News Agency)/Nazanin Tabatabaee via REUTERS

Iranian demonstrators react during a protest against the killing of Soleimani in front of the United Nations office in Tehran, Iran January 3, 2020. WANA (West Asia News Agency)/Nazanin Tabatabaee via REUTERS