Vigils in Iran that were held for the victims subsequently turn into protests. According to Twitter videos, hundreds of protesters in Tehran call for the resignation of Supreme Leader Ayatollah Ali Khamenei.
After Canadian Prime Minister Justin Trudeau suggests the plane was downed by an Iranian missile, Iranian authorities reject this theory. Iranian civil aviation chief says he is "certain" the plane was not hit by a missile, still asserting the cause was "mechanical failure".
U.S., Canadian, British and Iraqi officials say they believe the plane crash near Tehran in which 176 were killed yesterday was likely caused accidentally by an Iranian anti-aircraft missile, while Iran says it was due to "mechanical failure".
Iran's Islamic Revolutionary Guard Corps (IRGC) issues a statement warning regional countries not to allow the United States military to launch attacks on Iran from their territory or they "will be targeted".
In response to Iranian missile attacks on U.S. forces, the U.S. Federal Aviation Administration (FAA) bans all U.S. commercial flights from operating in airspace over Iraq, Iran, the Persian Gulf and the Gulf of Oman.
A rocket explodes inside the heavily fortified Green Zone sector of Iraq's capital, landing less than a mile from the U.S. Embassy in Baghdad amid heightened tensions in the region between the United States and Iran.