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Slovakian swimmer Tamara Potocka is receiving medical treatment after collapsing following her 200m medley heat at La Defense Arena.
Potocka, 21, collapsed by the side of the pool, where she was given immediate medical care.
BBC Sport has been told she is conscious, has been receiving oxygen and remains under medical supervision.
Potocka finished seventh in her heat and missed out on a place in the semi-final.