Russian media reports that an unidentified explosive device caused the deadly blast in a St. Petersburg metro station.
원문출처 : http://www.cnn.com/videos/world/2017/04/03/st-petersburg-blast-caused-by-unidentified-device-sot-nr.cnn
원문출처 : http://www.cnn.com/videos/world/2017/04/03/st-petersburg-blast-caused-by-unidentified-device-sot-nr.cnn