Two earthquakes with the magnitudes of 5.5 and 5.4 have struck off South Korea's southeastern coast, about 6km north of the port of Pohang, the national meteorological service said.
There have been no reports of human casualties so far.
The outer wall of an elementary school in Pohang has fallen after a magnitude 5.5 natural disaster hit the southeastern city on November 15, 2017.
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Nuclear reactors in the region operated normally when the nation's strongest-ever natural disaster at magnitude 5.8 hit Gyeongju in September 2016.
The epicentre was about 6 km north of Pohang, and the tremors were felt across the country.
Before the main tremor, earthquakes of magnitude- 2.2 and 2.6 struck areas near the Pohang city.
According to local TV footage, some of the buildings saw external wall damaged and window broken. Six aftershocks followed for about 30 minutes ranging from magnitude 2.4 to 3.6. Students were evacuated from school buildings and people stood on the streets after dashing out of office buildings and apartments. As the government is working to rescue residents in the affected areas, President Moon Jae-in, who came back from his 8-day tour of Southeast Asia this afternoon, just finished holding an emergency meeting on the situation with his top aides. Nuclear power plants in Gyeongju and the surrounding areas are reported to be safe and unaffected by the natural disaster.
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