A 21-year-old man has been arrested after racially offensive Twitter comments were made about footballer Fabrice Muamba, who collapsed after suffering a cardiac arrest during an FA Cup tie.
He is being held at Swansea Central police station, South Wales Police said.
The comments appeared on the Twitter account @liamstacey9, which has since been taken down.
While the feed was still visible comments claimed that his account had been hacked.
Other users of the micro-blogging service responded with outrage to the remarks.
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Page of @liamstacey9:
There are some very sad and sick individuals in this world.