US military aircraft also suspected of low flights over Japan's Kagoshima Pref. April 26, 2021 (Mainichi Japan) Osprey aircraft are seen flying low over the city of Amami, Kagoshima Prefecture, on Feb. 4, 2021, in this image provided by citizens' group Amami bloc pro-Constitution Peace Forum. KAGOSHIMA -- Amid the issue of U.S. military helicopters spotted flying over Japan's capital and the southernmost prefecture of Okinawa at very low altitudes, aircraft appearing to belong to U.S. Forces have also been seen more frequently in southwestern Japan's Kagoshima Prefecture. A record-high 137 sightings of low-flying aircraft were reported in Kagoshima in fiscal 2020, about 1.6 times the figure for the previous fiscal year. Among them, 83 were suspected to be of U.S. military aircraft -- another record-high -- as of December 2020. While many of these were over remote Amami-Oshima island, low-altitude flights possibly involving U.S. military aircraft have also been confirmed over the prefectural capital of Kagoshima, amid heightened U.S.-China tensions.