BEIRUT - A US Navy ship changed course in the Hormuz Strait on Saturday towards Iranian Revolutionary Guard vessels, a guards commander was quoted as saying on Tuesday while issuing a warning. 'The unprofessional actions of the Americans can have irreversible consequences,' Mehdi Hashemi was quoted as saying by the Fars news agency. A US official told Reuters on Monday that multiple fast-attack vessels from the Revolutionary Guard had come within 600 yards (550 meters) of the USNS Invincible, a tracking ship, forcing it to change direction.