Multiple fast-attack vessels from Iran’s Islamic Revolutionary Guard Corps came close to a US Navy ship in the Strait of Hormuz, forcing the American vessel to change direction. According to a U.S. official, who spoke on condition of anonymity, the Iranian attack-vessels came within 600 meters of the USNS Invincible, a tracking ship, and stopped. The Invincible and three ships from the British Royal Navy accompanying it had to change course, to avoid a hostile confrontation. The official said attempts were made to communicate over radio, but there was no Iranian response and defined the interaction as “unsafe and unprofessional.” The Islamic Revolutionary Guard Corps was not immediately available for a comment.