Before the war between the United States, Israel and Iran erupted in February, vessels passed freely through the strait without fees or direct Iranian oversight. "The concession has already been made regarding some form of control over Hormuz," one regional source told Reuters. Another regional official said negotiators were still debating how "control" would be defined, with Gulf states pushing for regional supervision of ship inspections and insisting that any transit fees remain voluntary. Oman has discussed fees closer to 3%, while the United States continues to oppose any mandatory charges. Iran says more than 3,400 people have been killed since the conflict began on Feb. 28, while the United States has reported 18 military fatalities.