Singer Chantal Kreviazuk changed the lyrics of the Canadian national anthem during the 4 Nations Face-Off championship game between the US and Canada on Thursday, adding further fuel to a contest already layered with political tension.

Canadian hockey fans began booing the American national anthem at Bell Centre in Montreal when Team USA played there on Saturday — sparking three fights to break out in the first nine seconds of the game, which the US won 3-1 with Canadian Prime Minister Trudeau in attendance.

The Canadian singer Chantal Kreviazuk would probably like to revisit some parts of her rendition of the Canadian national anthem during the final match of the 4 Nations Confrontation, which took place in Boston last night (February 20),