Seismic activity detected near North Korean nuclear site

Seismic activity was detected Saturday near the site of North Korea's Punggye-ri nuclear site, but it is not known whether a nuclear test caused the development. The first sign Pyongyang has conducted a nuclear test is usually seismic activity. North Korea has one nuclear test site -- Punggye-ri.
Read more: http://www.cnn.com/2017/09/23/asia/north-korea-seismic-activity/index.html?source=Snapzu