July 2021 Gulf of Oman incident

On 29 July 2021, the oil tanker "Mercer Street" was attacked off the coast of Oman. The United States Navy said the attack came from a drone. Israeli, United States and European officials blamed the attack on Iran. 
Iranian state media initially said the attack was in response to a possible Israeli airstrike on a military airport in Syria, but the Iranian government formally denied involvement.
Similar incidents occurred in May 2019, June 2019 and August 2021.