SEOUL, Dec. 1 (Yonhap) -- The chief of South Korea's spy agency said Wednesday there is a high chance that North Korea is likely to attack again following its deadly shelling of a front-line island late last month.

"North Korea pushed for reckless actions as internal complaints grew over its hereditary power succession and economic situations worsened," Won Sei-hoon, the chief of the National Intelligence Service, was quoted as saying by Rhee Beum-Kwan, lawmaker of the ruling Grand National Party.