The British ambassador to Iran, Robert Macaire, is arrested during anti-government protests, after attending a vigil and then, according to BBC, getting his hair cut. According to Tasnim News Agency he was arrested "on suspicion of organising, provoking and directing radical actions". U.K. Foreign Secretary Dominic Raab states the arrest is in "flagrant violation" of international law. More than an hour later, Macaire is released from custody.
Iraqi cleric and Grand Ayatollah Ali al-Sistani condemns both the United States and Iran over the escalation of conflict in Iraq, saying it shows blatant disregard for Iraqi sovereignty and the suffering of the Iraqi people.
A Boeing 737-800 crashes while taking off from Tehran Imam Khomeini International Airport, killing all 176 people on board. The incident, which took place amid the 2019–20 Persian Gulf crisis, is under investigation.
Iran's Islamic Revolutionary Guard Corps 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".