The Korean Olympic and Sport Committee (KSOC) confirmed on Friday that Kim had accidentally hit the Chinese swimmer in the face while they were in the pool training.
The Chinese swimmer, whose identity was not revealed, could not understand Kim's apology and later kicked her at the Gelora Bung Karno Aquatic Center, the KSOC said, prompting coaches from both sides to step in and separate them.
The Chinese officials apologised at the scene and later at the athletes village, it added.
China have won 16 of the 35 swimming gold medals claimed in Jakarta so far, while South Korea have yet to win their first.
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(Reporting by Amlan Chakraborty in Jakarta; editing by Peter Rutherford)
