A Revolutionary Guard commander vows decisive action to restore calm to Iran.
Iran's Islamic Revolutionary Guard Corps claims responsibility for the overnight missile strikes on Erbil in Kurdistan Region, Iraq, saying that the strikes were in response to "recent crimes of the fake Zionist regime". The missiles were launched from Iran's East Azerbaijan province.
The U.S. Treasury Department blacklists two Emirati companies for conducting business with Iranian airline Mahan Air, which itself is blacklisted for its close ties with the Iranian Revolutionary Guards.
The United Kingdom announces it is joining a United States-led naval mission in the Persian Gulf to protect oil tankers, following several seizures in international waters by Iran's Islamic Revolutionary Guard Corps.
The United States Central Command (CENTCOM) releases a video showing what CENTCOM spokesperson says, is an Iranian Revolutionary Guard Corps' patrol boat approaching the Kokuka Courageous "and was observed and recorded removing an unexploded limpet mine from the M-T Kokuka Courageous." Iran denies involvement.
United States Secretary of State Mike Pompeo announces the designation of the entirety of Iran's Islamic Revolutionary Guard Corps as a Foreign Terrorist Organization (FTO), effective April 15. This will be the first time the United States has designated a part of another government as a terrorist organization.