North Korea staged what appears to be the largest firing drill on Tuesday to mark the 85th founding anniversary of its military, a government source said.
"Signs are detected that North Korea's military is conducting a large-scale drill around the eastern port city of Wonsan on the anniversary," the source said.
North Korean leader Kim Jong-un is presumed to have watched the exercise involving some 300-400 long-range artillery pieces that can put Seoul and its adjacent areas within range, it added.
North Korea is expected to conduct a nuclear test or launch a ballistic missile before or after the anniversary of the Korean People's Army on April 25, raising fears of escalating tensions on the Korean Peninsula.
The United States has directed the nuclear-powered aircraft carrier USS Carl Vinson and the nuclear-powered nuclear submarine, Michigan to the waters of the Korean peninsula to restrain its military provocations. 

Source: QNA