According to the Japan Broadcasting Association (NHK), an explosion occurred in the area of the ammunition depot of the US military in Okinawa in Japan, and people were allegedly injured.
According to relevant persons from the Japanese Self-Defense Force, there are reports that the area where the explosion occurred was a temporary storage facility for recycling "duds". At present, the Japanese Self-Defense Force is stepping up verification of the relevant situation.

Japan Broadcasting Association (NHK) report with pictures

Source: @CCTV International News