South Korea's President Park Geun-hye has warned that inter-Korean relations could destabilize following the imposition of a "reign of terror" that on Sunday saw Jang Song Thaek being arrested for multiple anti-party and anti-state crimes.

Her warning, made at a cabinet meeting held in Seoul on Tuesday, came amid continued and increasingly critical North Korean media coverage of Jang Song Thaek's "elimination" from the party.