Send this page to someone via emailFour people are facing charges after a trespassing investigation at Western University led to the seizure of a loaded handgun and the discovery of hazardous chemicals at a nearby residence in London, Ont., police said. According to an initial release, the investigation began early Saturday morning when the Western University Special Constable Service arrested a man for trespassing on campus following a foot pursuit. London police were called to assist at about 1:40 a.m., where officers located a loaded handgun at the scene of the arrest. Get breaking National news For news impacting Canada and around the world, sign up for breaking news alerts delivered directly to you when they happen. In its latest release Wednesday morning, the London Police Service said officials are continuing an active investigation, which will be extensive and ongoing on Chesham Avenue.