Fans at a Toronto Raptors game have continued an emerging trend of booing the American national anthem at pro sporting events in Canada.

Thought to be an unhappy reaction to President Donald Trump’s tariffs, the boos were heard in Calgary, Alberta, Ottawa, Toronto and Vancouver.

In a symbolic show of anger, Canadian fans began booing the Star Spangled Banner before NHL and NBA games over the weekend. The mass protests come on the same weekend that U.S. President Donald Trump imposed 25% tariffs on imports from Canada and Mexico,