A New Zealand produced P/A series where only children survive....
http://www.youtube.com/watch?v=du5B_gT9wmA
Heres the first part of ep one... there have been a few series of this.. I've never been able to catch em all, but the basic story is that there are different gangs which seem to be at war with each other. Enjoy....
Pretty good info on wiki too.
http://en.wikipedia.org/wiki/The_Tribe_(TV_series)