In a televised address, Iran's Supreme Leader Ayatollah Ali Khamenei vowed not to 'back down' to anti-government protests, accusing demonstrators of acting on behalf of opposition groups and the United States. Authorities have largely cut Iran off from the outside world with an internet blackout. »»» 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/@