Dozens of COVID-19 cases have been detected at U.S. military bases in Okinawa Prefecture, Gov. Denny Tamaki said Saturday, with the military later confirming two cluster infections.

Tamaki said that he had received a report from the U.S. side that “a large number” of American military personnel had been infected with the novel coronavirus, though the military did not disclose an exact figure.

Local media reported that the number of infections was likely to top 60 and that several facilities were involved, including Marine Corps Air Station Futenma and Camp Hansen. NHK meanwhile said upwards of 50 cases had been found, citing unidentified sources.