Four people are in custody after police discovered chemicals they say could be used to create explosives at a home in London, Ont. But, new information shows the suspects were working on developing an anti-drone weapon system. Here’s what we know so far. »»» 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: