'Sorry, this is a test, by the way,' Prime Minister Mark Carney said after his meeting with Princess Margriet of the Netherlands was briefly interrupted by Ontario's test of Canada's Alert Ready system. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.tiktok.com/@cbcnews Subscribe to CBC News on Snapchat: https://bit.ly/3leaWsr Subscribe to CBC News on