keywords: explosion korea seoul blast mushroom
text: Blast, Mushroom Cloud Reported in N. Korea SEOUL, South Korea - A large explosion occurred in the northern part of North Korea, sending a huge mushroom cloud into the air on an important anniversary of the communist regime, a South Korean news agency reported Sunday.    The Yonhap news agency, citing an unidentified source in Beijing, said the explosion happened Thursday in Yanggang province near the border with China...