The clash occurred in a tunnel leading from the playing field to the locker room area in the stadium.
Police said Langkilde was accused of assaulting two players, one a 26-year-old who sustained facial injuries and the other a 21-year-old who suffered broken facial bones, police said.
A third Wales victim, 24, also sustained facial injuries.
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Langkilde was taken into custody at his San Francisco hotel on Sunday. Police said the investigation was ongoing.
(Reporting by Frank Pingue in Toronto; Editing by Ian Ransom)
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