Transcript for North Korean spies attempted to sabotage the 1988 Olympics in Seoul

We'll terrorism have been very much on the minds of officials in South Korea this week. The Olympics will be held in Seoul this summer. But North Korea continues to protest the selection solely as the Olympic site and our concerns that the north may attempt to disrupt the game. The South Korean government firmly believes it's bitter enemy the north is determined to disrupt the games especially since last November's bombing of a South Korean jetliner. Obama possibly planted by two passengers may have caused Sunday's crash of a Korean airliner 115 people were on board to who got off in the Persian gulf. May have planted the bomb. Two passengers thought to be Japanese got off they had checked no baggage. After 858 departed they took the next flight out. To Bahrain further up the gulf where the Korean flight continued on destined for Bangkok and finally South Korea it vanished over the thick jungles of Burma. Officials speculate that. It may have blown up in midair they discovered that. The two passengers who disembarked in Abu Dhabi were traveling with false passports the pair was detained at the Bahrain airport while waiting to be interrogated the couple took poisoned capsules from a pack of cigarettes. And in view of immigration police swallow them. Both collapsed unconscious the woman is in critical condition the man who later died. This woman who confess to being in North Korean agent. Claims she planted the bomb is part of a plot to wreck the Olympics. The fear of terrorism here increased dramatically after last November's bombing of a Korean jetliner apparently by North Korean agents. Despite the fact that North Korea built its Olympic Stadium and trained athletes for the games he turned down the south offered a post by the events. Called for a Communist boycott. Apart Cuba and North Korea and certainly will not let them. Seoul Olympics we'll have the distinction of being the most heavily guarded sporting event in history more than 9000 athletes marched in. The largest number in Olympic history. The opening ceremony itself was a celebration of Korean culture ancient the modern. And the thrilling.

This transcript has been automatically generated and may not be 100% accurate.