Calgary Flames coach Bill Peters acknowledged in a letter of apology on Wednesday that he used offensive language in dealing with a Nigerian-born player 10 years ago in the minors.

General manager Brad Treliving confirmed receipt of the letter, which was first posted on Twitter by TSN, a Canadian sports cable network, during the third period of Calgary’s 3-2 overtime victory at Buffalo.

Treliving would only say the Flames are reviewing the letter as part of their continuing investigation into Peters, and that the GM could have an update as early as Thursday.

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Without specifically revealing the words he used, Peters wrote in the letter that he knows his comments to Akim Aliu have been the source of both anger and disappointment.

Flip the Page to see the letter: