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[SEOUL] South Korea's President Moon Jae-In said on Tuesday North Korea should swiftly return South Koreans and Americans detained in the reclusive nation.
American university student Otto Warmbier, who had been held prisoner in North Korea for 17 months, died at a Cincinnati hospital on Monday just days after North Korea released him from captivity in a coma, his parent said.
Three other US citizens, who are ethnic Koreans, and six South Koreans remain in custody in North Korea.
Mr Warmbier, 22, who was arrested in North Korea while visiting as a tourist, had been described by doctors caring for him last week as having extensive brain damage that left him in a state of "unresponsive wakefulness".
US President Donald Trump blamed the "brutality of the North Korean regime" for Mr Warmbier's death.
South Korea's Blue House on Tuesday cited Mr Moon as saying "it is very deplorable that North Korea does not respect human rights".
The South Korean government will make every effort for the return of those held in North Korea, a presidential spokesman Park Soo-Hyun told a briefing.
North Korea said last month it was its sovereign right to "ruthlessly punish" US citizens it has detained for crimes against the state.
Korean Americans Tony Kim and Kim Hak Song who worked at the foreign-funded Pyongyang University of Science and Technology (PUST) were recently detained for hostile acts against the state, according to North Korea's state media.
In March 2016, Kim Dong Chul, a 62-year-old Korean-American missionary, was sentenced to 10 years hard labour for subversion.
North Korea is also holding Canadian pastor Hyeon Soo Lim. He was charged with subversion and given a hard labour life sentence in 2015.
Three South Korean nationals were detained in North Korea during their missionary work respectively since 2013 and the remaining three South Koreans are North Korean defectors who returned and are currently held in custody, a lawmaker briefed by the South Korean spy agency told reporters last week.
Tensions on the Korean peninsula have been heightened by dozens of North Korean missile launches and two nuclear bomb tests since the beginning of last year. Pyongyang has also vowed to develop a nuclear-tipped intercontinental ballistic missile capable of hitting the US mainland.
Pyongyang continued to test-fire missiles since South Korean leader Mr Moon took office pledging to engage in dialogue with Pyongyang.