 This photo, provided by the unification ministry, shows a South Korean liaison officer talking to his North Korean counterpart at the Seoul bureau of their joint liaison office on October 4, 2021. (Archive photo: Yonhap)
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Seoul's unification ministry said the North was unresponsive to the closing call via the joint liaison hotline at 5 p.m. after it did not answer the opening call at 9 a.m.
The ministry earlier said as there was no problem with communication lines in the South, it will closely monitor the situation, including the possibility of a technical problem in the North.
The two Koreas typically hold phone calls twice a day at 9 a.m. and 5 p.m. via their joint liaison office channel.