(Yicai Global) Sept. 3 -- A strong shallow earthquake struck the Democratic People's Republic of Korea (DPRK) today, geological monitoring agencies reported.

The 5.6-magnitude tremor's epicenter was 10 kilometers deep, the US Geological Survey reported. 

An explosion may have caused the event, said the China Earthquake Networks Center, who placed the magnitude at 6.3 and the epicenter's depth at 0 kilometers.