The home secretary says "new and serious patterns" have emerged in illegal migration, causing "major challenges" for national security.
Yvette Cooper adds that smuggling gangs are using drones "to spot where the border patrols are".
But she adds that it is "governments, not gangs" that should decide who enters the country.
Cooper was speaking to foreign delegates at the Border Security Summit in London.
Report by Brooksl.
Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn