Three men and one woman, all in their 20s, are facing a number of charges involving the possession of firearms and explosives. The arrests, dating back to late January, show that they are all currently attending or recently graduated Western University in London, Ont. Police allege they were storing chemicals that could be made into explosives at a house just west of the university campus. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and