Dominion Security Services provides security guard services in London, Ontario, as well as event security and construction security services
http://dominionsecurityservices.com/, 301 OXFORD ST W

Top Defence is a premier Canadian store for CCTV and video security equipment, we provide security services for home and medium businesses along with a variety of equipment for video security
http://www.topdefence.ca, 250 Milestone Crescent, Aurora, Ontario