(CNN)Canadian Prime Minister Justin Trudeau took a knee during a Black Lives Matter demonstration in Ottawa on Friday. Trudeau's act of solidarity comes after he declined to comment earlier in the day about whether he would be attending the protest. Still, he arrived at Parliament Hill -- home to Canada's Parliament -- wearing a black cloth mask Friday afternoon and surrounded by security guards, according to CNN affiliate CTVnews. Trudeau did not speak at the event, though he clapped and nodded along with some of the other speakers, including a moment when a speaker asserted there is no middle ground...